Have occasional AFIB and had an EKG last month. Was told it was nothing to worry about. I used to really push my heart to the extreme and did so again about a month ago to see if I could make it into a top 10 spot on Strava. Happy to report I squeaked in and passed that stress test even though it left me gasping for air for about 30 seconds after the climb. Read some time ago that such idiocy causes either micro-tears or scaring, but if I going to go, let it be on a bike. Don’t have to worry about dying during sex considering how long we have been married, and better yet, it won’t freak out the bike.