... gymnastics because of my heart function. My doctor says I can, but I have to take it slow. But my step dad is a doctor too and he says that I shouldn't, what should I do? Right now I am taking 50 mg of atenolol and it doesn't help my shortness of breath that much, but I try not to complain so most of the time people don't notice. So what if my coach (that I have know for a long time now) doesn't notice and I pass out? I don't know what to do. Please help.