From J.Lo’s no-rest training to The Rock’s 4 a.m. workouts, these six celebrities redefine what it means to stay fit. In this video, we break down the most extreme fitness routines in Hollywood—where ...

There's a good chance you'd love to build ripped abs and bulging arms, just in time for beach season. But that doesn't mean you always want to do it in the gym. Sometimes, you'd much rather avoid ...