They say exercise is good for you - but clearly it can sometimes be bad for you. My constant T was brought on by cycling fast downhill - and I've had it for c. 15 years now. Subsequently, whenever I cycled fast downhill (and who cycles slowly downhill?), my T got louder - but, after a while, would go back to it normal pattern, i.e. sometimes loud, sometimes quieter. I've noticed that swimming also makes it louder (at least, for a while). However, I'm very reluctant to give up exercise, as I need to do it to reduce the risk of having another heart attack.