I wouldn't presume to tell you what you should do, but I went to the gym almost every day that I was in A-fib after I was diagnosed. It seemed to make me feel better but my pulse was rarely over 110, so working out just made it feel "right" somehow. I found the elliptical machine too exhausting on some days but the treadmill was always tolerable. I think everyone is different in this A-fib condition. My advise, consult your cardiologist; mine never told me I couldn't exercise. Good luck!