I do bicycles and crunches, and chest presses lying on a bench. If I prepare properly (as in having an almost empty stomach) I am fine. Sometimes not. It takes a lot of trial and error to get the formula right. But that is why I wondered about the chest pain during exercise in particular. I wish someone would develop an exercise program for people with GERD/LPR, just like a university in Australia developed one for people with osteoporosis. Even if you have reflux, you need good abs for core strength and balance.