Olympian John Daly risks his life on a regular basis and he can’t get enough of it. As a skeleton racer, he goes 90 miles an hour on a sled head-first, with his face just an inch from the ice. The skeleton sledding track is roughly one mile long and the force exceeds 5 Gs. You have to “embrace the speed instead of being afraid of it,” Daly says. If you get tense, the sled will slip and you'll crash.” Daly seems to have the fearless thing down pat: He is currently competing in his third winter Olympics.