31-year-old Maroon 5 frontman, Adam Levine, bares all in the UK's Cosmopolitan Magazine to raise awareness for prostate and testicular cancer. So how does Adam look so good? (Images sorta NSFW)Yoga!Adam is a big fan of yoga and uses it to stay "buff and sane." He tells Women's Health: When I started practicing I instantly felt more sculpted. Yoga carves you into a different person—and that is satisfying physically... I had been lifting weights for years. After our first yoga session, I vowed never to lift another weight again. Yoga is by far the most convenient way to exercise while I'm on the road. You don't need anything but a few feet of space and a mat... Yoga will drastically improve you in every way imaginable.