Tim O'Donnell & Rich Roll: The most important marker of heart health

Tim O'Donnell, a professional long-course triathlete with more than 50 podium finishes, survived a widowmaker heart attack during the Challenge Miami triathlon in 2021.

Now, he's taken his health into his own hands; Not only to get back out on the course and take home another title, but to ensure he's on the right track to living healthier longer.