The elite category of endurance athletes is truly incredible. They run 50-mile ultramarathons, bike the 23-day Tour de France, and generally achieve physical feats that seem superhuman. But there is a limit to the human body, and scientists have found it.Aug. 16, 2019
UP NEXT
Cast of TNT’s ‘Inside the NBA’ opens up about Kobe Bryant’s death
05:24
Cupid’s helpers send 100,000 valentines from Colorado
01:14
Sanders on Bloomberg ads: I’ve got a problem with ‘literally buying elections’
00:37
Pete Buttigieg: Trump can’t ‘figure out what to do with me’
04:41
Helicopter crash victim’s husband says wife ‘was an amazing woman’
03:03
Kobe Bryant’s former helicopter pilot says basketball star ‘never’ pressured him to fly