American Heart Association: Much more is not always much better.
For most people, the benefits of aerobic exercise far outweigh the risks, however, extreme endurance exercise – such as participation in marathons and triathlons for people who aren’t accustomed to high-intensity exercise – can raise the risk of sudden cardiac arrest, atrial fibrillation (a heart rhythm disorder) or heart attacks, according to a new Scientific Statement. READ MORE
(Source: American Heart Association, 02/26/2020)