Celebrity Fans: Cameron Diaz, Kelly Clarkson, Madonna, Jessica Biel, Vanessa Hudgens, Malin Ackerman
Even though it's been around for nearly 20 years, CrossFit is still sweeping the nation—and Hollywood—as one of the most intense workouts ever. The varying style of vigorous, heart-pounding circuit training combines weightlifting, plyometrics, cardio, kettlebell workouts, and more. With this type of routine, it's not about how long you exercise, but how hard you do it. It's no surprise that kick-butt females like Cameron Diaz and Jessica Biel are fans!
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