Jordan D. Metzl, MD, is a nationally known sports medicine physician at New York City’s Hospital for Special Surgery, author of The Athlete’s Book of Home Remedies, an eleven-time Ironman triathlete and a 30-time marathoner. He appears repeatedly on New York Magazine’s esteemed Best Doctors list, is a regular guest on the “Today” show and has contributed to “Good Morning America,” The New York Times, and National Public Radio. He also developed the Ironstrength workout designed to build kinetic chain strength that has been performed by millions of athletes around the world. He lives in New York City.