Greg Presto is a sports and fitness reporter and video guy in Washington, D.C. who thinks fitness should be fun and an adventure, whether you're on a trail, in the gym, or on the living room floor. He is an ACE-certified personal trainer whose work has appeared at Men's Health, Women's Health, Shape, Prevention, Reebok, USA Today, and other publications. Follow him on Twitter at <a href="www.twitter.com/gregpresto" target=_blank"@gregpresto or send story ideas to gregpresto@gmail.com.