exercise

THE COACH IS ON THE ROAD. THE APP IS IN THE GYM, OR THE OFFICE, OR THE STADIUM, OR….

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I am somewhere between Salt Lake City and Omaha, with my Golden Retriever pup Ellie in her crate in the back with approximately 2,000 miles still ahead of us.

I’m behind the wheel for 7-10 hours a day. So the real Coach Keir is unavailable this week. He is driving, hydrating, eating cans of tuna and soup (yep, this is a thing with me), and listening to audiobooks about ultra-processed food (also a thing with me) while Ellie sleeps soundly in between pit stops (thankfully, this is a thing with her).

The AI Coach Keir, however, has not taken a single day off.

When I have a moment to check in on the app’s backend, this week I’ve been watching athletes I normally train with in person open The Slowfit Method® app, describe whatever equipment they have in front of them, and get complete, detailed, coaching-cued workouts back in seconds. No appointment. No Zoom link. No waiting for me to get off the highway.

Here’s what that looks like in practice.

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Bob was at a track in San Francisco with stadium steps and a jump rope.

He asked for a 30-minute circuit with some push-ups or burpees. This is what Coach Keir AI gave him:

Warm-up (5 minutes): 2 minutes easy jump rope, World’s Greatest Stretch x5 per side, Hip 90/90 for 60 seconds, thoracic rotation x5 per side, leg swings front/back and side to side x10 each.

The circuit (20 minutes, 4 rounds, 60-90 seconds rest between rounds): Jump rope 60 seconds at moderate pace, stadium steps — run or power-walk up, walk down (one full trip), push-ups 10-15 reps full range chest to ground, burpees 5 reps quality over speed with full extension at the top, stadium steps — second trip up, walk down.

A legitimate Foghorn workout. Stadium steps, bodyweight, jump rope. No gym required.

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Chris had a jump rope and a 30lb sandbell.

He asked for a HIIT workout. Coach Keir AI named it the Foghorn HIIT — Rope and Sandbell and built him this:

4 rounds, approximately 30 minutes, 60 seconds rest between rounds.

Jump rope for 60 seconds, sandbell slam for 10 reps, jump rope for 45 seconds, sandbell clean and press for 8 reps, jump rope for 30 seconds, sandbell rotational lunge for 6 reps each side.

The coaching cues were specific: for the sandbell slam, drive it down from overhead with the whole body — hinge, load the hips, reach to the sky, then throw it at the ground. For the clean and press, it is one fluid movement, not three separate ones. For the rotational lunge, step into it, rotate the sandbell across the lead knee at the bottom — Weck Method rotational power, head over foot, spiral through the spine.

The science note at the end cited Dr. Martin Gibala’s research at McMaster showing that short interval sessions match or exceed hours of moderate cardio for VO2 max and metabolic function. Then it linked his book.

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Chris came back and asked for more.

This time: TRX, sandbell, and jump rope together. Coach Keir AI called it the Foghorn Full-Body Athlete and built a 40-minute, 4-round session.

Warm-up: jump rope 2 minutes easy rhythm, TRX hip hinge x10, TRX chest stretch 30 seconds each side, sandbell halo x8 each direction.

The circuit: jump rope double time for 60 seconds, TRX atomic push-up for 8 reps (full push-up, then drive both knees to chest simultaneously at the top — hips level, no piking), sandbell rotational slam for 10 reps (load the hip on one side, rotate through the torso, slam at a diagonal, alternate sides — pure rotational power), TRX suspended lunge for 8 each leg (rear foot in the cradle, front foot planted, sink straight down — these will humble you fast at any fitness level), sandbell clean and press for 8 reps, TRX row for 12 reps (body at 45 degrees or lower, pull elbows past ribs, squeeze scapulae at the top, slow the eccentric on the way down — that’s where the gains live), jump rope single leg alternating for 30 seconds each leg (balance and coordination challenge as much as cardio — if you lose it, reset and go again, no ego), sandbell lateral lunge and reach for 6 each side (step wide, sit into that hip, reach the sandbell toward the outside of the foot at the bottom — loaded hip mobility pattern, perfect for longevity goals).

Finisher after round 4: sandbell farmer carry 2×40 steps, jump rope 90 seconds your choice of tempo, TRX plank hold 60 seconds.

Recovery note from Coach Keir AI: after a session like this, the lymphatic system needs to move that metabolic waste out. Don’t just collapse on the couch — take a 10-minute walk, get some elevation in the legs, and hydrate. That’s where the adaptation happens.

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Brought a Smile to My Face.

This is the app doing exactly what it was built to do. Bob and Chris train with me regularly in San Francisco. This week, while I’m in a car somewhere in the Mountain West, they are getting complete Foghorn-style sessions with full coaching cues, exercise science citations, and recovery protocols — built specifically for the equipment they have in front of them, in real time.

The free tier gives you ten exchanges with Coach Keir AI. Start there. Ask it what to do with the equipment you have. See what comes back. There are also a handful of written and video-on-demand workouts already loaded up in the app; you can run those if you’re feeling lucky. But remember, this is not just something for heavy-sweating gym rats (and no, I’m not suggesting that Bob and Chris are heavy-sweating gym rats). If you want to learn how to breathe better, eat better, sleep better, manage stress better, etc.—The app and I are here for you. Even if one of us is gripping a steering wheel non-stop for the next week.

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One more thing: want to talk to the real Coach Keir?

This is new. I’ve added an easy way to book a free 30-minute introductory call with me to learn more about the Slowfit Method® and/or my AI Coach app, to discuss your training goals, or to explore what a private coaching relationship might look like. No pressure, no pitch — just a conversation.

BOOK HERE

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One more pitch for the app! The Slowfit Method® app puts Coach Keir AI in your pocket — trained on all ten pillars including Movement and Strength. One hundred people have already downloaded this app, and I’ve got nine 5-star reviews on the App Store. Check it out! Slowfit Paid is $29.99 a month — a dollar a day — and gives you unlimited coaching chat conversations, full Vault access, and a growing library of on-demand workout videos.

GET THE APP

Stick around.

Best,

Keir

Keir J. Beadling is a human performance coach, founder of Foghorn Fitness, and creator of the Slowfit Method®. He coaches athletes and everyday humans in San Francisco and worldwide. More information is available at foghornfitness.com.

The Month Cartilage Science Changed Everything — And What It Means For Your Knees Right Now

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A few weeks ago I wrote about my own knee osteoarthritis diagnosis — the swollen left knee that wouldn’t quit, the 30cc of fluid my orthopedic surgeon’s staff drained in his office, the Baker’s cyst, the MRI findings, the cortisone shot, the pending hyaluronic acid injection series. I promised updates as things developed.

Here’s the update: I just completed a multi-day karate special training. Strenuous, demanding, the kind of training that tests your entire body and your mind in equal measure. My knee is still not perfect. The inflammation is ongoing. And I did it anyway — not because I was reckless, but because the emerging science told me I should. And because I’m in the business of continuing to do the things that I love, that give my life meaning.

More on that in a minute.

First, I want to tell you about what has happened in cartilage science in the last several weeks. Because I think we are genuinely watching a paradigm shift in real time. And if you have osteoarthritis, or know someone who does, you need to understand what’s coming.

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Three Pieces of Research. One Converging Message.

Let me lay out what’s happened in quick succession, because the timing is remarkable.

**Piece One: The Biological Framework (Howard Luks, MD)**

Howard Luks — sports medicine orthopedic surgeon, one of the most evidence-based voices in joint health — has been arguing for years that the conventional model of osteoarthritis is simply wrong. The “wear and tear” framing that leads patients to stop moving, stop loading, stop doing the things they love is not supported by the biology. As Luks writes, cartilage is a living, biologically active tissue that gets its nutrients from synovial fluid — and the only way synovial fluid circulates through cartilage is through compression and release. Load the joint, unload it, load it again. Movement nourishes cartilage. Inactivity starves it.

The primary driver of OA progression, Luks argues, is not mechanical grinding but chronic low-grade inflammation — specifically the cytokines IL-6 and TNF-alpha — that poisons the cellular environment where chondrocytes (cartilage-making cells) are trying to do their jobs. Your knee is downstream of your systemic biology. Everything that reduces your inflammatory load protects your joints.

This framing matters because it completely reorients what you should be doing about OA. Not resting. Not restricting. Training smartly, sleeping well, eating clean, managing stress — these are joint protection strategies, not just general wellness platitudes.

**Piece Two: The Exercise Intensity Study (Song & Meng, Medicine, May 2026)**

A randomized controlled trial published in Medicine in May 2026 put 120 patients with moderate knee OA (Kellgren-Lawrence Grade 2-3) into four groups: low-intensity aerobic exercise (50-60% heart rate reserve), moderate-intensity (60-70% HRR), high-intensity (70-80% HRR), or a control group. Three sessions per week, 30 minutes of treadmill walking or stationary cycling, continuously heart rate monitored, for 12 weeks.

The results were remarkable across every measure they tracked.

The high-intensity group saw a 28.5% drop in serum CTX-II — a direct biomarker of cartilage breakdown — over 12 weeks. The control group got slightly worse. On MRI, the high-intensity group increased medial cartilage thickness by 4.8% and volume by 4.2%. Pain dropped 52.5%. WOMAC scores — a comprehensive measure of OA pain, stiffness, and function — improved 45.3%. The 6-minute walk test improved by 71 meters, nearly triple the established threshold for clinical meaningfulness. 80% of high-intensity participants achieved clinically meaningful pain relief.

No serious adverse events. Zero dropouts due to exercise-related problems. These were people with moderate osteoarthritis exercising vigorously for 12 weeks.

Loading the joint did not thin the cartilage. It thickened it.

The dose-response data showed a threshold effect between 60-70% HRR where the benefit curve gets dramatically steeper. For most people, the sweet spot appears to be roughly 65-75% of heart rate reserve — vigorous but sustainable. The authors’ own conclusion: current exercise recommendations for knee OA patients are overly conservative, and many patients could safely tolerate and benefit from significantly more intense exercise than has traditionally been prescribed.

**Piece Three: The Stanford Breakthrough (Agarwal, Su, Ancel et al., Science, June 12, 2026)**

And then, just weeks after the Song & Meng paper, Stanford Medicine published what may be the most significant development in OA research in decades.

The study, published in Science, identified a single aging-related enzyme — 15-hydroxyprostaglandin dehydrogenase, which the researchers term a “gerozyme” because it accumulates with age and drives tissue degeneration — as a master regulator of cartilage aging. Block this enzyme, and something remarkable happens: existing chondrocytes undergo transcriptional reprogramming to a more youthful state. They don’t need to be replaced. They don’t need stem cells. They just need the aging brake released.

In aged mice, small-molecule inhibitors of 15-PGDH promoted cartilage thickening and regeneration of functional hyaline cartilage — the smooth, load-bearing kind, not scar tissue. The treatment reversed natural age-related cartilage thinning, improved joint function, and when administered after simulated ACL injuries, strongly mitigated post-traumatic OA progression and associated pain.

Most compellingly: human OA cartilage explants from total knee replacement surgeries — worst-case specimens, cartilage so degenerated it required surgical removal — showed decreased degradation markers and evidence of new articular cartilage formation when exposed to the 15-PGDH inhibitor in the lab.

And crucially, an oral version of the 15-PGDH inhibitor has already completed Phase 1 safety trials for age-related muscle atrophy. The safety profile is established. The path to a cartilage-specific clinical trial is shorter than starting from scratch.

Helen Blau, the Stanford researcher leading this work, put it plainly: “Imagine regrowing existing cartilage and avoiding joint replacement.”

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Why This Convergence Matters

Three independent lines of research — a clinical framework, a randomized controlled trial, and a molecular biology breakthrough — landing in the same window, pointing in the same direction.

The old model: OA is irreversible mechanical wear. Cartilage grinds down. Rest what’s left. Manage pain until you need a new joint.

The emerging model: OA is primarily a biological failure — chronic inflammation, aging-related molecular brakes, a cellular environment that has become hostile to the very cells responsible for maintaining cartilage. And biological failures can be addressed biologically. Through exercise. Through systemic inflammation management. And potentially, soon, through targeted molecular intervention that allows your own chondrocytes to become youthful again.

This is not incremental progress. This is a paradigm shift.

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The Caveats

I’m not going to oversell this, because we all deserve the full picture.

The Stanford study showed human cartilage regeneration in vitro — in a lab dish, not in a living human patient. Mouse-to-human translation in cartilage research has historically been difficult. The jump from promising preclinical results to clinical reality is where most breakthroughs stumble. Realistically, if the 15-PGDH inhibitor clears Phase 2 and 3 trials for cartilage regeneration, you’re probably looking at 3-5 years minimum before it’s available to patients. That’s fast by drug development standards. It is not imminent.

The Song & Meng study lasted 12 weeks with 120 participants. The authors themselves note that the short-term MRI cartilage changes may partly reflect alterations in cartilage hydration rather than true structural remodeling, and that longer-term studies are needed to confirm genuine tissue regeneration.

And the Luks framework, while compelling and well-supported, is still fighting against decades of conventional medical conservatism. Most orthopedic surgeons are still telling their OA patients to take it easy (including my own, sigh).

What I’m saying is: the direction of the evidence is clear and genuinely exciting. The clinical applications require patience.

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What I’m Doing Right Now — And What You Should Consider

I want to share my own protocol, because I think it’s the most practical thing I can do.

**Exercise intensity as medicine.** Based on Song & Meng, my therapeutic target on the bike is 65-75% of heart rate reserve. With my resting HR of 45 and max HR of 175, that’s roughly 128-143 bpm — Whoop Zone 3, comfortably hard, sustainably challenging. Ideally three sessions per week, 30 minutes of work. This is the study protocol, and I’m treating it that way.

**VMO strengthening.** My MRI showed lateral patellar subluxation — my kneecap tracks too far to the outside, which is a primary driver of my patellofemoral OA and inflammation. Terminal knee extensions, backward sled drags (Kelly Starrett’s recommendation), and heavy standing bike climbs are my primary VMO tools. The patella tracks where the VMO tells it to. Strengthen the VMO, improve the tracking, reduce the grinding.

**Systemic inflammation management.** The Slowfit Method® pillars are not just training advice — they are, in the context of OA, direct joint protection strategies. Sleep quality, clean nutrition, stress management, lean body composition: all of these reduce the inflammatory cytokine load that drives OA progression. Every pillar is working in service of every other pillar.

**Voltaren topically, not Aleve systemically.** Topical diclofenac delivers NSAID-level anti-inflammatory action directly to the joint with roughly 6% of the systemic absorption of oral NSAIDs. Lower risk, more targeted. My default post-activity tool. I don’t love the idea of leaning on NSAIDs for anything, but as Kelly Starrett says, to stay ahead of the snowstorm, you’ve gotta sweep the front steps every hour. One of those sweeps, for me, is a little Voltaren.

**Normatec for lymphatic clearance.** Pneumatic compression after training sessions to move fluid and support recovery. Not a treatment — a recovery tool.

**The HA injection series coming next month.** Hyaluronic acid viscosupplementation to restore the joint’s natural lubricating environment before I start loading it with Starrett-level work.

**And the karate.** I just completed a demanding multi-day special training that would have been unthinkable six months ago when the knee was at its worst. Not pain-free, not without managing it carefully before, during, and after. But done. Because the evidence told me that movement is the medicine, fear of movement is the enemy, and an active 57-year-old with moderate patellofemoral OA who keeps training is doing more for his cartilage than one who sits on the couch waiting to feel better.

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A Note on Howard Luks

I’ve reached out to Dr. Luks directly for his perspective on the Stanford study. His read on how the 15-PGDH research intersects with the exercise intensity data — and what it means clinically for active patients managing OA right now — is worth having. I’ll update this post or publish a follow-up when I hear back.

If you’re not already reading Luks’ Substack, you should be. He is one of the authentic, most honest voices in orthopedic medicine writing for a general audience today.

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Why We Do This

The oft-cited Kelly Starrett — physical therapist, coach, mentor, and one of the clearest thinkers in the movement and performance space — talks about training in terms of “spending credits.” The idea is simple: we put in the work so that we can spend the credits on the activities we love. The training is not the point. The training is what makes the point possible.

For me, that means triathlon. It means karate. It means being able to toe the start line at the Escape from Alcatraz, to show up for special trainings, to get smashed around on my surfboard, to keep doing the things that make me feel most alive at 57. The knee work — the Zone 3 cycling sessions, the VMO strengthening, the backward sled drags, the HA injections, the Voltaren, the Normatec, the sleep and nutrition discipline — none of it is the destination. It’s the price of admission for the life I want to keep living.

That’s what the Slowfit Method® is ultimately about. Not optimization for its own sake. Training as a means to a life fully lived. And the emerging science around OA — exercise as cartilage medicine, chondrocytes capable of becoming youthful again — tells us that life can be longer, more active, and more capable than we previously had any right to expect.

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The Slowfit Method® Take

None of this surprises me from a Slowfit Method® perspective. What it does is give us a richer, more precise scientific language for what we’ve been building here.

The Slowfit Method is, at its core, a biological framework for human performance. We train because training creates adaptive signals. We treat sleep, nutrition, stress management, and recovery as pillars — not accessories — because your body is a system and every pillar affects every other one. We monitor training load and recovery state because the dose matters.

The emerging OA science adds a beautifully specific prescription: the active person navigating knee osteoarthritis should not back off. They should lean in — smartly, progressively, with heart rate guidance, with the other pillars in order. The goal is to provide the biological stimulus your cartilage needs, maintain the synovial fluid circulation that nourishes chondrocytes, and keep the systemic inflammatory environment as calm as possible while you wait — with genuine hope now — for the molecular therapies that may soon be able to do what no drug has ever done before.

Repair the joint itself.

More updates to come. In the meantime, keep moving. Your cartilage is counting on it.

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Take the Slowfit Method® With You

If you want to put these principles into daily practice, the Slowfit Method® app is now available on iOS. Training guidance, recovery protocols, and the full Slowfit Method® framework — built into a tool you can use every day. I’ve been building this for a while and I’m genuinely proud of what it’s become.

Get the app

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*Nothing in this newsletter constitutes medical advice. If you’re dealing with joint pain, please see a qualified sports medicine physician or orthopedic surgeon. The information here is intended to complement — not replace — professional medical guidance.

Questions, reactions, pushback? Hit reply. I read everything.

Keir

Foghorn Fitness

foghornfitness.com | foghornfitness.substack.com

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Foghorn Fitness is home to The Slowfit Method® — a science-backed, whole-person approach to human performance. If someone forwarded this to you and you’d like to subscribe, we’d love to have you.

The Most Underrated Longevity Drug Costs Nothing and You Already Know How to Do It

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A Foghorn Fitness / Slowfit Method® dispatch

Oops, I did it again. I went and disappeared for two more years from this here blog. Again. I promise not to do that again. My apologies. The original intent of The Lemonade Chronicles was as a sort of real-time journal of a reluctant stay-at-home dad as he approaches mid-life. Most of the “action” (if you can call it that) transpired more than 10 years ago. Everything leading up to my mid 40s, and something of an existential struggle.

Ten-plus years on, and things are waaaaaaay different.

My kids are in their 20s and miraculously, my wife and I seem to have done a reasonably good job with the boys, Max and Everett. I suppose that parenting never really ends, but the degree to which we exert control over their lives lessens every day. And I’m cool with that. Hilary is still the rock of our family, steadfast as always. We’ve had some losses, as is the case with life. Hilary’s parents. Aunts and uncles on both sides of the family. We lost our beloved Lab Wailea a couple years back. And time is taking its toll on people around us about whom we really care.

As for me? My own evolution, as a human being chasing the elusive bright side, has continued. Picked up pace, even, in the last 6 or 7 years. Ten years or so ago, I had a lot of questions. What is the meaning of life? How do I take care of myself and the people (and animals) that I love? Am I doing it right? These questions served as the impetus for creating another (and presumably my last) little company.

This is the human performance company called Foghorn Fitness.

As I think about it, this is the culmination of my life’s work. Everything I’ve learned to this point. And really, somehow I think I’ve managed to build a pretty robust vehicle to help guide folks (and myself) to a happier and healthier life. There’s even an app for it!

I’ve been writing a ton, just not on this platform. Everything is now over at Substack. That’s now the place to go for the good stuff, though I suspect I’ll continue spinning yarns here, as well. If you’ve followed me years ago, agitating about Alien Heads, dogs who eat money, and missing the school bus, I think you’ll find this latest chapter of mine of interest. I hope you will. When last we were acquainted, I had so many questions about life. Maybe you did too. Now I think I have the answers. Well, at least some of them. I hope you’ll join me and come along for the ride.

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To that end, I’m going to jump right into it. Maybe a more apt image would be walk right into it. Because this post is about walking. Walking? Yep. Walking. Bear with me….

Because this is a thing you already know how to do — have known since you were about a year old — that is one of the most evidence-backed longevity interventions available to you, costs absolutely nothing, requires no equipment, no gym membership, no coach, and can be done anywhere on earth.

You are almost certainly not doing enough of it.

Walking. That’s it. That’s the whole revelation.

I know. Anticlimactic. But stay with me, because the research is genuinely surprising, and the running boom — I say this as someone who runs — has done a lot of damage to walking’s reputation that it doesn’t deserve.

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WALKING IS THE SIXTH VITAL SIGN

Dr. Courtney Conley and Dr. Milica McDowell just published Walk: Rediscover the Most Natural Way to Boost Your Health and Longevity — One Step at a Time, and it is the book I’ve been waiting for on this topic. What James Nestor did for breathing, what Kelly and Juliet Starrett did for mobility, Conley and McDowell do for walking. Their central argument: walking is as important to your health and longevity as sleep and proper breathing. It is the sixth vital sign. And yet we’ve almost engineered it out of our lives.

The details are striking. Your walking speed can predict your overall health status and risk of early death. Your risk of falls and longevity can be measured by your foot health. And the number of daily optimal steps is not 10,000, it’s fewer. That last one will rearrange some people’s mental models. And hopefully rearrange people’s shoe closets. Enough with the foot coffins, folks.

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BORN TO WALK—AND LIFT, SPRINT & PLAY

Mark Sisson’s Born to Walk makes the case most forcefully, and it’s worth spending a moment here because his full prescription maps almost exactly onto the Slowfit Method®.

Sisson’s argument isn’t just that running is overrated. It’s that we’ve misunderstood the entire architecture of human physical activity. He describes a movement pyramid built around four layers:

Low-level aerobic movement — walking — as the foundation. This is your Zone 2 base. Sustained, conversational-pace movement that builds mitochondrial density, improves insulin sensitivity, and develops your aerobic engine without the joint stress of running. Walking is Zone 2 for most people. The running boom convinced an entire generation that anything less than hard cardio didn’t count. That was wrong. Instead, most of us are running ourselves into the ground.

Strength training as the second layer. Not optional. Sisson is explicit: lifting heavy things is what signals the body to maintain muscle mass, protect bone density, and keep hormones functioning as you age. Same argument Attia, Luks, and Topol all make in the longevity books I covered last month. Muscle is the organ of longevity.

Sprinting and high-intensity work as the third layer, but sparingly. Short, hard efforts a couple of times a week. Not chronic cardio. Brief, intense, and followed by full recovery. This is what Foghorn’s HIIT sessions are built around.

Play as the fourth layer. Sisson is serious about this one. Unstructured physical activity, sports, martial arts, open water swimming, anything that involves moving your body in ways that aren’t predetermined by a machine or a program. In the Slowfit framework this is the spirit behind karate, pickle ball, whatever gets you moving in ways your body wasn’t expecting.

The Slowfit Method® has been built around exactly this hierarchy since day one: low-and-slow aerobic base, progressive strength work, occasional high-intensity effort, and enough variety to keep the body adapting and the mind engaged. Sisson just gave it a name.

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THE LONGEVITY CONNECTION

Last month I wrote about three longevity books, Attia, Topol, Luks. All three converge on the same point. Eric Topol’s seven-year Wellderly Study, the people who reached their late 80s without major chronic disease, found no genetic smoking gun. What separated them was lifestyle: they were physically active. They walked. Howard Luks makes it plainly in Longevity…Simplified: walking counts. Not as a consolation prize for people who can’t run. As a legitimate, evidence-supported health intervention.

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THE BODY IMAGE RESEARCH NOBODY IS TALKING ABOUT

And here is the piece that’ll encourage us to touch grass. Outside Online published new research by Dr. Viren Swami, a psychology researcher who has spent years studying nature exposure and body image. In the largest survey on this topic, researchers analyzed self-reported habits of more than 50,000 people aged 18 to 99 from 58 countries. Despite vast differences in age, location, and gender, connecting with nature was linked to positive body image.

But the experimental work is the part worth sitting with. A short 30-minute walk in nature promotes improvements in positive body image in the immediate term. And here is the detail that really landed: when participants took a walk in a built, urban environment, high-rise housing blocks, offices, shops, and parking lots, the walk actually caused a slight decline in body satisfaction. Walking in a natural environment increased it.

Same duration. Same physical effort. Different environment. Opposite psychological outcome.

Swami frames it this way: positive body image is when we begin to think of the body not in terms of what it looks like, but in terms of how it functions, how it helps us navigate from place to place, and all the wonderful things it does for us in everyday life. Nature creates the conditions for that shift. The urban environment, shop windows, advertisements, the constant social comparison of city life, works against it. Sounds kinda like the social media comparison-o-rama, no?

This maps directly onto Conley and McDowell’s framing of walking as biological necessity rather than exercise. When you’re moving through a natural environment, you are not performing for anyone. You are a body doing what bodies were built to do.

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ADD WEIGHT. SERIOUS THINGS HAPPEN.

Michael Easter’s Walk with Weight: The Definitive Guide to Rucking takes this one step further. Rucking, walking with a weighted pack, is one of the oldest forms of human physical training, refined over centuries of military conditioning. It loads the posterior chain, builds functional strength, and elevates the metabolic demand enough to produce real fitness adaptation while remaining low-impact.

Start with 20-30 pounds and go 2-3 miles. Build from there. I program rucking regularly for clients whose bodies are telling them to back off the high-impact work. Nobody has ever come back disappointed. If you’re going to read one book to get started, Walk with Weight is it. And GORUCK is my go-to when it comes to rucksacks (discount code in that link).

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THE SLOWFIT METHOD® TAKE

Walking is the Movement pillar at its most accessible. But as Sisson makes clear, and as we practice at Foghorn every week, walking is only the foundation. The full pyramid is what produces lasting fitness: walk as your base, lift to preserve muscle and bone, sprint occasionally to keep your cardiovascular ceiling high, and play to keep your body adaptable and your brain engaged.

That’s not a novel prescription. It’s what humans did for most of our evolutionary history. We just stopped doing it when gyms started selling us the idea that one type of hard cardio was enough.

A few things from Walk worth implementing immediately: your walking speed matters, so don’t shuffle. Your foot health matters, so ditch the cushioned stability shoes and let your feet actually feel the ground. And the 10,000 steps target is more marketing than medicine, quality of movement beats raw step count.

One more thing: if you want to go deeper on any of this, the walking research, Zone 2, rucking, the Slowfit Movement pillar, Coach Keir AI knows the full methodology. The Slowfit Method® app is now live on the App Store, free to download with a 10-message trial. Ask it anything. It won’t shuffle. Want to learn more? Wrote about the new app here and here. I’m proud of it; sure hope you’ll check it out.

DOWNLOAD ON THE APP STORE

Your action today: go for a walk that is at least 30 minutes, outside, somewhere that isn’t a parking lot. Leave the earbuds out for the first ten minutes. Notice what happens to how you feel about yourself.

That’s the whole protocol.

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See you out there somewhere!

-Keir

P.S. Speaking of walking, did a fair amount of that up the infamous Baker Beach Sand Ladder this past weekend during the 2026 Escape from Alcatraz Triathlon. Congrats, too, to Foghorn athlete (and eldest son) Max Beadling on his first triathlon (and on absolutely smoking his dad).

P.P.S. New website, new merch! Please have a look at the latest & greatest Foghorn website and if you’re interested in a new Foghorn hat (blue on black logo pictured above), let me know!