Swedish research in almost 45,000 men found those who exercised intensely more than 5 hours per week at age 30 had a higher risk of developing atrial fibrillation compared to less than an hour per week. This risk was even higher if they quit exercising later in life. Walking/bicycling at older ages was associated with a lower risk.
PositiveTip: Daily, moderate, regular exercise yields the best benefits for a lifetime of healthy living.