Limitless with Chris Hemsworth

So far, Chris has done everything possible to delay the aging process. Now he's facing his most extreme and emotional challenge: three days in a retirement village while wearing an aging suit that turns the simplest activity into a Herculean task.

Chris has always worked to keep his body healthy; now it's time to start looking after his brain. Neurologist Dr.

As Chris bulks up for "Thor: Love and Thunder", he needs to build a body that looks right for an immortal god. But, he also wants the kind of muscles that are scientifically proven to help him stay strong and healthy as he grows older in real life.

Chris turns to longevity doctor Peter Attia to find out how changing his eating habits can help his quest for longevity. Ironically, the answer is to eat no food at all for four long days.

To maximize longevity, you might think it's best to play it safe and stay cozy. But some scientists believe we should do the opposite, as exposure to extreme temperatures can trigger our bodies' own defenses against the killer diseases of old age.

Ever since his teenage years, stress has been part of Chris's life, and he wants to learn how to deal with it better. Psychologist Modupe Akinola challenges him to stay calm during a terrifying walk along a crane that's projecting out from the roof of a skyscraper.