Biohacker Dave Asprey built his multimillion-dollar brand Bulletproof around his quest for longevity. But is any of it legit?
Those gains might come at a price.
It's been 25 years since an aging prizefighter, a quirky gadget, and iconic ’90s marketing combined to take over the world.
More swimmers are embracing the idea of doing laps in freezing-cold water as an actual sport.
Former CrossFit Games athlete Marcus Filly burned out from overwork, then built himself back up with this smart, safe training method.