Body · 12 episodes
Fitness & Exercise for entrepreneurs
Nobody on this show argues that fitness is optional for entrepreneurs. What they disagree on is which lever matters most. Some guests point to muscle and strength as the real predictor of long-term function, others to VO2 max and cardiovascular capacity, others to sleep, and still others to nervous system regulation through breath and cold exposure. Nobody thinks diet alone explains outcomes, and several explicitly push back on that assumption. The common thread isn't a single practice, it's that physical inputs are treated as direct levers on decision-making, energy, and resilience, not as separate from the business.
The other consistent thread is that consistency beats intensity, and environment beats willpower. Compound interest, not heroics, is the metaphor that keeps recurring: daily movement, a repeatable diet, structured sleep, and small hourly resets do more than occasional extreme efforts. Several guests also warn that looking fit can hide real problems, biomarkers, cortisol, visceral fat, cholesterol, that outward leanness doesn't reveal. And a few push past physical mechanics entirely into identity: what happens when the discipline that built the business becomes the thing burning the founder out.
Where it gets genuinely useful is in the specifics. A breath-hold test as a stress gauge. Blood flow restriction training to build muscle without loading joints. DEXA scans over BMI. Air squats every hour instead of one long gym session. This page collects the mechanisms, not just the encouragement to 'take care of yourself.'
What holds across every conversation
- •Test a breath hold or grip strength check as a quick, free readout of nervous system stress and recovery capacity.
- •Move every hour, not just once a day; research on hourly air squats shows near-equivalent benefit to a single 30-minute session.
- •Get a DEXA scan and basic blood panel before trusting body fat percentage or how you look in the mirror.
- •Build hormetic stress (cold, breath holds, sauna) deliberately into your week to train tolerance for high-stakes business stress, not just physical stress.
- •Design your environment (pre-planned meals, removed junk food, fixed routines) instead of relying on willpower, since partial consistency still produces statistically real results.
- •Prioritize muscle strength and VO2 max training now; both are among the strongest predictors of independence and healthspan decades out.
Strength, muscle, and staying upright
Multiple guests independently name muscle strength, not cardio or diet, as the strongest predictor of long-term independence and longevity.
“The number one predictor of longevity is muscle strength and partly because you keep your balance, you don't fall over, everything stays upright.”
Dr. Mihir Patel: Muscle Strength, Longevity & Joint Health · 44:03· listen →
“Hip fractures, if you look at the medical studies out there, it's a 90% mortality rate at the end of 1 year.”
Dr. Mihir Patel: Muscle Strength, Longevity & Joint Health · 5:45· listen →
“When you get older, it's much harder to build muscle. So if you have a younger audience, go to the gym. And I see it a lot when you go to the gym, you see much less women, especially in our age, lifting weight. And it is important.”
Biomarkers, Biological Age & the Science of Healthspan · 25:24· listen →
“Blood flow restriction is— think in simple terms, think a tourniquet. You put a tourniquet on your leg, you work out, and you get a burn a lot faster than you would otherwise because you've cut the blood supply off. But it's measured, it's calculated, and it lets you build the muscle but without the extra weight.”
Dr. Mihir Patel: Muscle Strength, Longevity & Joint Health · 43:30· listen →
“The difference in literally the years you will live, but also the quality of those years. They can actually predict based on your VO2 max when you can no longer live independently and you're going to have to have somebody help.”
Fitness for Busy Entrepreneurs with Eric D'Agati · 15:27· listen →
Consistency over intensity
Fitness works like compound interest, and the data shows partial adherence still moves the needle, which removes the excuse that all-or-nothing routines are required.
“It's not like getting your haircut where you do get it done and you can come back 2 weeks later. It's cumulative. And that's what most people don't get. They think of it in isolation and in a silo.”
Fitness for Busy Entrepreneurs with Eric D'Agati · 3:26· listen →
“The research shows that doing as little as some air squats every single hour has almost the same impact as if you were to do 30 minutes on the bike at the end of the day.”
Fitness for Busy Entrepreneurs with Eric D'Agati · 4:46· listen →
“What we saw was, as you'd expect, people who were more consistent saw improved results. But the group that had 29 to 50% consistency still saw statistically significant improvements.”
The ROI of Health and Fitness for Entrepreneurs · 23:36· listen →
“If I don't move every day in one way or another, things get bad, so I always make that a huge priority.”
Alex Canavan: Building Community Without Burnout · 14:12· listen →
“I eat the same thing every day. For the most part, like down to a T. And that might sound like a little much, but honestly, it's made my life significantly easier and less stressful.”
Alex Canavan: Building Community Without Burnout · 19:55· listen →
Breath, nervous system, and hormetic stress
Deliberate breath holds, cold, and other controlled stressors train the amygdala and endocannabinoid system, building the same adaptive capacity used to handle high-stakes pitches and decisions.
“The idea of hormetic stress is consciously and intentionally inducing stressors in order to make adaptations. If you think about it in simple terms, it's what happens when you really strength train. When you lift weights, you're inducing a stressor to the muscles and to the fascia. There's a bit of inflammation because of that, and then you get stronger.”
Reset Your Nervous System for Peak Performance · 23:27· listen →
“3 minutes of deep breathing, strong, and you have to focus on it a bit, it can't be very passive, followed by a maximal voluntary breath hold increased circulating human growth hormone in the blood by up to 550% a half hour after that was done.”
Reset Your Nervous System for Peak Performance · 37:45· listen →
“We have nociceptors that are threat receptors. Touch a hot pan, threat receptors take the information, the threatening heat, danger. That sends the signal afferently to the brain, and really through the spinal cord and the brainstem. The brain then makes processes and makes a decision on the pain perception to come back out.”
Reset Your Nervous System for Peak Performance · 8:44· listen →
“The reason we don't take breathwork seriously is because we call it breathwork when in fact it's respiratory physiology. And if we could just understand that it's respiratory physiology and this is real and not woo, people would get more out of it perhaps.”
Reset Your Nervous System for Peak Performance · 45:27· listen →
“Most people unfortunately kind of are living at the simmering 7, especially entrepreneurs. They're constantly at this simmering 7 or 8. They never really get to 10, and they also never get down to 0, and so they kind of burn out because they're revving at this high RPMs.”
Fitness for Busy Entrepreneurs with Eric D'Agati · 21:03· listen →
Looking fit isn't the same as being healthy
Lean bodies still carry hidden risk. Biomarkers, glucose monitors, and DEXA scans expose problems that mirrors and scales don't.
“I was sitting maybe at 11, 12% body fat, which is by all accounts relative to the regular population, very, very lean. But I still had high cholesterol and started to do some more work there and realized this runs in my family.”
The ROI of Health and Fitness for Entrepreneurs · 9:46· listen →
“I would see these blips throughout the day in the glucose monitor that were in the normal range, but that it wasn't associated with food... there are cortisol pops to increase glucose... So it wasn't that I am super chill... I was completely unaware of the physical impact that was happening on my body.”
The ROI of Health and Fitness for Entrepreneurs · 12:40· listen →
“You have 2 women who have 26% body fat. One might have 1 pound of visceral fat, one might have 3 pounds. They're the same weight, the same percent body fat, but the amount of visceral fat they have is dramatically different.”
Longevity As a Competitive Edge: Jesse Levey on Health Strategy · 18:09· listen →
“The 2 things I think are most foundational are blood work and DEXA scan... they're not expensive, it's like $50 to $100.”
Longevity As a Competitive Edge: Jesse Levey on Health Strategy · 38:55· listen →
“And by the way, bad night's sleep have a lot of an effect the day after. You make a bad decision. You are more grumpy. You have a higher chance to have higher rates and high glucose and your testosterone usually is lower. And so you are also, your cortisol, your stress is higher. You are more prone to get injured.”
Biomarkers, Biological Age & the Science of Healthspan · 32:58· listen →
Environment design beats willpower
Guests converge on the idea that removing friction and pre-deciding routines produces better outcomes than relying on discipline alone.
“Environment drives behavior. And is the biggest influencer on behavior that people don't talk about more than anything else. Myself, people say, oh, you must be so disciplined. You must have high willpower. I have neither, nor do I want either.”
The ROI of Health and Fitness for Entrepreneurs · 26:38· listen →
“The very first thing is finding your why, your purpose. for doing it. That's the very first thing. And having that and sticking that somewhere that you can see all the time, because that is the core behind what's going to get you into these behaviors.”
The ROI of Health and Fitness for Entrepreneurs · 36:12· listen →
“Definitely, the goal that helps with hard choices has to be really the big goal. We want big things. And even if they take 5 years, they can help us with those hard choices now and develop this microprogressive system to get there.”
Jerzy Gregorek: Hard Choices, Easy Life Explained · 18:45· listen →
“As a leader, as an entrepreneur, you're constantly having to make quick decisions all day long. You're having to solve everyone's problems. And it's just nice to have one less problem to solve.”
Alex Canavan: Building Community Without Burnout · 23:28· listen →
Rest, recovery, and not burning out the leader
The body that builds the company also has to survive it. Several guests learned this the hard way, through burnout, forced exits, or physical breakdown.
“I had shown up and fixed this exact problem I was having for so long here in Central New York, but I fixed it for everybody else. And I was very much building, the founder of a startup company, and I was not prioritizing building a support system for myself and making sure that my own social-emotional needs were being met by the people around me.”
Alex Canavan: Building Community Without Burnout · 5:46· listen →
“I ended up getting to the point where I said, this is pretty ironic. I'm going to school and learning how to teach people how to recover and be healthy. Yet I am probably at the most unhealthy point in my life.”
Dr. Spencer Lalk: Storytelling, Health & Startup Growth · 8:31· listen →
“When I take calls now, I pop in AirPods and I walk while I talk. It's actually gonna provide some clarity in your thought and open up some space in your brain to continue to be productive and creative, to drive innovation in your business.”
Dr. Spencer Lalk: Storytelling, Health & Startup Growth · 27:23· listen →
“As a human, your number one job in life is to be a professional sleeper... if you can do that, then the idea is you go to bed on time and you wake up when you're done, the same way you go to work on time and you leave work when you're done.”
Longevity As a Competitive Edge: Jesse Levey on Health Strategy · 13:43· listen →
“So there's a lot that goes into really preserving that energy when I'm not, quote unquote, out in public.”
Ashley Black: Necessity, Near-Death & High Vibration Living · 10:09· listen →
The companion guide
Reading about fitness & exercise is one thing. Changing it is another.
John’s companion guide turns what these conversations cover into something you can actually work through.