This is the guy everyone loves to hate—not only was he recently named PEOPLE magazine's Sexiest Man Alive, but he also makes being fit look so easy. Even a guy like Tatum can get a little round around the edges though. "I like to be lean,” he tells PEOPLE. “And when I'm not training, I get really round and soft." So how does he avoid the flab? He does CrossFit, of course—and loves the constantly changing routines because they help him beat workout boredom.