Is It Possible to Get Fast-Twitch Type Two Muscle Fibers?

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"I've always had to work my ass off in that space, but yeah, I do feel I've had some benefits there," he said. "It's a great variant of a gene to have as you age because one of the hallmarks of aging is actually atrophy shrinkage of these fast-witched muscle fibers." He added: "The fact that you kind of have a genetic predisposition to have more of them is a good thing"

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Chris Hemsworth, best known for his role as Thor in the Marvel movies, joins Peter to discuss his recent work in the docuseries called Limitless. In the docuseries, Chris undertook extreme challenges to explore his physical and emotional limits and gain insights into longevity. In this episode, Chris discusses these many challenges—from fasting to arctic swims to 100-foot rope climbs—as well as the insights that he gained from each. Peter, who also played a role in the docuseries, guides Chris through the science of longevity, including what Chris’s APOE-ε4 genotype means for his risk of Alzheimer’s disease. Additionally, Chris describes how his outlook on health, happiness, work-life balance, and more have changed from his experience on Limitless.

We discuss:

Limitless: how Chris got involved and his overall experience filming the docuseries [3:00];
“Fasting” ‒ ep. 3 of Limitless in which Chris attempts a 4-day fast [8:15];
“Shock” ‒ ep. 2 of Limitless in which Chris swims in the Arctic Ocean [12:15];
Cold exposure: the potential physical and mental benefits [19:30];
“Strength” ‒ ep. 4 of Limitless in which Chris explores how muscle can improve longevity [21:15];
The APOE-ε4 genotype and Alzheimer’s disease risk [31:30];
How Chris uses sauna [39:45];
“Acceptance” - ep. 6 of Limitless in which Chris explores the meaning of life by contemplating death [42:15];
Chris’s new perspective on work-life balance [52:00];
“Stress-Proof” - ep. 1 of Limitless in which Chris learns about the impact of stress and how to manage it [54:30];
Chris reflects on his intrinsic motivation driven by both fear and purpose [58:00];
Chris reflects on his career arc and how his presence as an actor has evolved [1:01:15];
How Chris’s outlook has changed since filming Limitless [1:05:00]; and
More.