From Zac Efron to Mario Lopez, see these sexy stars take their shirts off
Jon Bon Jovi
"I was doing Workout 101 for years: treadmill, elliptical, weights. Now I'm going to do yoga," the rocker (in St. Barts in January 2012) tells Men's Health. "I went for my first time, and I enjoyed it. I'm a 21st-century man."