Mark Zuckerberg takes on nearly impossible fitness challenges.

A tough test was completed by Facebook's founder. Everything with a ten-pound bag on top.

Every year on May 30th, the United States observes Memorial Day, a day to honor military personnel who have died in the line of duty. 

And one name stands out each year during this commemoration: Michael Murphy, a Marine who died in action in Afghanistan in 2005.

Crossfitters created the Desafio Murph in memory of the military, which has now become a sort of tradition for Crossfitters and Marine fuzileiros.

 It's not a little feat: first, a 1.6-kilometer run, followed by 100 ascents, 200 stretches, and 300 jumps; the series concludes with another 1.6-kilometer run. 

Zuckerberg completed the challenge in 39 minutes and 58 seconds, a time recognized by other athletes as a spectacular

eat that is only accessible to one percent of all who attempt it. "In the last race, the pernas are exaustas due to agachamentos, and the cardaco pace is brutal," he said.

ments and just completed a five-kilometer run under 20 minutes.

She has won medals in jiu jitsu tournaments and just completed a five-kilometer run under 20 minutes.