Greg Presto is a fitness reporter, filmmaker, and the author of "The Workout Bucket List: Over 300 Life-Changing Races, Epic Challenges, and Incredible Hikes, Bikes, Lifts, and Runs around the World, in Your Gym, or Right in Your Living Room," available now wherever books are sold. His work has appeared in Men's Health, Shape.com, Livestrong.com, USA Today Sports, and many others. He lives in Kampala, Uganda.