He is living proof that his methods work, having since competed in 33 marathons and 14 triathlons (and counting)!
Voted among New York City’s top sports medicine doctors by New York Magazine, Dr. Metzl teaches The New IronStrength Workout to runners and other athletes twice a month to help them get stronger and prevent injury.
Participants in a published study said that high-intensity interval training with shorter, more frequent intervals was easier compared with longer, less-frequent workouts.
“My take?” says Dr. Metzl. “If you haven’t tried a HIIT workout, you may be missing out on a type of exercise that will not just do you a world of good but that you could fall in love with.”