I am a full A cup as well, and I can agree that general exercise is fine, but jogging worries me because they bounce up and down from that and it is so painful, it's like gravity is trying to rip them off me. I have noticed that while not wearing a bra, and attempting to jog, if you keep your pectoral muscles flexed that are under the breasts, that they don't bounce nearly as bad. But I have not yet invested in a "normal" bra as I didn't think they were big enough yet for that. Sports bras are ok, but they get hot due to being so close to the under arm. I guess I will just have to suck it up and find an A cup bra, which feels embarrassing to look for, they are so hard to find. I need a 36A.