A longevity and sports medicine doctor who completed 15 Ironmans shares his workout routine. It includes a run-commute.

Dr. Jordan Metzl, a sports medicine doctor, says exercise is a key component to longevity. Jordan Metzl Dr. Jordan Metzl is a sports medicine doctor practicing in New York City. He said regular exercise is one of the most important parts of longevity. He strength trains in the morning and runs home after work. From a very young age, Dr. Jordan Metzl knew that playing sports energized and helped him focus. It wasn't until years into his career as a sports medicine doctor that he began prescr...