From the boardroom to the classroom, the big screen to the small, these guys are at the top of their game. They’ve conquered mountains—both literally and figuratively. They’re record breakers, superheroes, and regular Joes. And that hard work, drive, sweat, and discipline is just a tiny part of what keeps them among the world’s fittest. ALEX O'LOUGHLIN The Five-O, 34
● Even the star of TV's hit Hawaii Five-O remake concedes that he's "not 21 anymore." Still, Alex O'Loughlin says that his "body's never been better." The Australian-born actor certainly looks legit in his role as a former Navy SEAL, thanks to interval training, boxing, and—yes—plenty of surfing. Another big secret to his six-pack? O’Loughlin says he chugs a gallon and a half of water daily and sticks to a low-sodium diet.
JORDY SMITH The Wave Rider, 24
At 6'2" and nearly 190 pounds, the South African native is the biggest, tallest guy on the World Surf Tour. He’s also one of the best. Smith finished 2010 as No. 2 on the ASP World Tour, behind only Kelly Slater. Smith is a pioneering new-school surfer, boosting huge aerial tricks high above the lip of the wave. He runs outdoors and hits the gym for spinning, skipping rope, lifting, and stretching. The only thing he likes better than working out? “Hitting the water and surfing until dusk,” he says.