Danny Kavadlo is one of the world's leading authorities on calisthenics and personal training. He has authored several internationally-acclaimed, books, including the #1 Amazon bestsellers Strength Rules and Diamond Cut Abs, as well as the cult classic Everybody Needs Training. He’s appeared in The New York Times, The Huffington Post, Men’s Health, and is a regular contributor to Bodybuilding.com and TRAIN magazine.

As a Master Instructor for Dragon Door's acclaimed Progressive Calisthenics Certification, Danny travels the world teaching bodyweight strength training to athletes, professional trainers, and fitness enthusiasts from all walks of life. His latest work (co-authored with his brother, Al Kavadlo) is called Street Workout, and is considered by most to be the bible of urban bodyweight training. Danny lives in Brooklyn, NY with his son Wilson and their dog Rex.