If you really must exercise, only do just enough to stop feeling horribly frustrated and no more. You could have a very bad relapse. You probably have to stop exercising before it starts to feel difficult in order to not have a relapse. I would do something very small and see how that goes. Justa few exercises lying on the floor, or walk outside for 2 minutes or something, or less if you can't manage that without it feeling difficult. You may be able to do more but you really need to be careful. Everyone here has different exercise tolerances and you really have to get good at 'guesstimating' whether or not you can handle activity. It isn't easy. Good luck.