True, but I think the commentor is referring to the U-shaped relationship of AF and endurance training. Higher probability with zero exercise, lowest probabili

True, but I think the commentor is referring to the U-shaped relationship of AF and endurance training. Higher probability with zero exercise, lowest probability at moderate exercise, but an increase in probability as you enter the extreme territory. In my case, 1000+ hours/year for 8 years led to this outcome