Exercise is a MUST for MVPS/D patients, though they cannot tolerate exercise well. You have to begin simply and slowly by walking for 5 minutes, if you can tolerate that much. Then gradually over weeks add more minutes and distance. Ride a bike or swim. Whatever your body will tolerate. I used to play tennis for an hour with friends. My husband would remind me, "Only one hour." But I wanted to play longer! If I did, the following day I could barely function.