The iconic actor played Iceman, Doc Holliday, Batman, and Jim Morrison, but behind all the mythic roles was a man grasping for meaning wherever he could find it. Here he opens up about cancer, strength, and death.

Activities include: getting his own stem cells injected into his body every six months, taking 100 supplements a day, following a strict diet, bathing in infrared light, hanging out in a hyperbaric oxygen chamber, and wearing yellow-lensed glasses every time he gets on an airplane.

A jogging buddy collapses during a marathon, his heart suddenly finished beating. The writer goes looking for answers.

In Mexico’s remote Copper Canyon, the Tarahumara Indians party hard, get by on a diet of carbs and beer, and can still run 100 mile races, even in their 60s.