Is VO2 Max "Overrated"? (& What To Focus On Instead), Old Man Olympics, Big Toe Health & More With Mark Sisson
Boundless Life
Ben Greenfield
4.6 • 5.3K Ratings
🗓️ 14 May 2026
⏱️ 72 minutes
🧾️ Download transcript
Summary
Full Show Notes: https://bengreenfieldlife.com/sisson2026
In this episode with Mark Sisson, you'll discover why VO2 Max may be overrated as the gold standard for longevity, and why chasing it cost Mark 32 pounds of muscle and the real-world function that actually matters. You'll explore his "Old Man Olympics" framework: a decathlete's approach to fitness at 72, spanning strength, speed, balance, and endurance. You'll also get his take on cold plunging, alcohol, biohacking, AI, and find out why foot health may be the single most overlooked lever in your longevity toolkit, from bunions to glute activation to big toe function.
Mark Sisson ignited the ancestral health movement with Mark's Daily Apple and The Primal Blueprint, popularized keto and intermittent fasting with The Keto Reset Diet and Two Meals a Day, and sold Primal Kitchen to Kraft Heinz for $200M. He now runs Peluva, a toe-separated shoe company built around restoring foot strength and healthy gait, and is the author of Born to Walk.
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Transcript
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| 0:00.0 | My name is Ben Greenfield and on this episode of the Boundless Life podcast. |
| 0:04.9 | What is it about longevity that we really are seeking to achieve and it's mobility, right? |
| 0:11.1 | We want to certainly live longer, but we want to be able to do things as we live longer. |
| 0:14.5 | We want to be able to walk around the world and travel and play with our grandchildren and sorts of types of movement. |
| 0:19.7 | My focus became one of more |
| 0:22.5 | of a decathlet perspective, which is rather than focus on just that one metric of V-O-2 Max, |
| 0:28.9 | all these things start to have real, real impact. Welcome to the boundless life with me, |
| 0:35.1 | your host, Ben Greenfield. I'm a personal trainer, exercise physiologist, |
| 0:39.2 | and nutritionist, and I'm passionate about helping you discover unparalleled levels of health, |
| 0:44.8 | fitness, longevity, and beyond. Let's talk probiotics. |
| 0:55.9 | If you've accepted bloat and cravings and a postmill crash after eating as your new normal, |
| 1:01.0 | then know that you can feel better. |
| 1:03.7 | And here's the cheat code. |
| 1:05.1 | The Just Thrive Gut Essentials bundle. |
| 1:08.1 | This pairs two clinically proven gut superstars. Just Thrive, Probiotic, |
| 1:13.3 | and the digestive bitters that go along with those, kind of like turkey and cranberry, but without |
| 1:18.4 | the bloating. Just Thrive Probiatic is the only probiotic clinically proven, derived 100% alive in |
| 1:24.1 | your gut so those little critters can make a difference you'll actually feel less |
| 1:27.9 | bloat, better energy, and even clear skin. Then there's digestive bitters, which has 12 science-backed |
| 1:33.3 | herbs in one tasteless capsule. That's a good thing, as the name implies. It would be bitter otherwise. |
| 1:38.9 | That jumpstart your digestion and supports GLP1 production. That's pretty cool. So together, |
| 1:48.1 | these work to help you digest food better and not go lay on the couch farting after you have a meal. |
... |
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