A decade-long study of 152 recreational marathon runners, published in JAMA Cardiology, suggests that running marathons does not cause lasting heart damage. While the heart's right ventricle showed a temporary decrease in pumping ability immediately after races, it recovered within days. Crucially, over ten years, no permanent damage to heart function was observed. This research addresses prior concerns stemming from elevated troponin levels post-marathon, which can indicate heart strain but, in this context, did not correlate with lasting damage.