I've got ectopic beats, so exercising is always really difficult because it increases the frequency of them by a lot and they become much more prominent. I've been trying to lose some weight recently, and for the first time today I've been able to do some light exercise without checking my pulse or taking breaks to stop the ectopic beats! Huge win since I usually compulsively check my heart rate or straight up stop as soon as my heart has an extra beat.