Extreme Exercise
Being physically active is an important part of a heart-healthy lifestyle. But
too much exercise may be dangerous to your heart and increase the risk of afib. Lavie said studies have shown that people who exercise more than 40 minutes per day are at increased risk for atrial fibrillation. People who do extreme amounts of exercise, such as marathon and triathlon athletes, are also at greater risk of afib. "A little exercise is good for you," said Lavie. "But people who do extreme amounts of exercise have some adverse effects." From a heart-health perspective, Lavie said the ideal amount of exercise is probably about 35 to 40 minutes of moderate physical activity per day.
Trish, I copied this from an article I was reading online about heart disease. I remember one time we discussed the safe amount of exercise we should do per day. When I was exercising regularly, sometimes I would do 60-75 min of exercise, but it was not all strenuous exercise. I always did some cardio, but not usually more than 30 min. The rests was weights and my punching bag, which might be considered cardio, but it's start and stop.
When I went to cardiac rehab, the exercise physiologist told me that 150 minutes per week was good for health, but for weight loss you should do 300 min per week. That is more than 30 min per day.