I do not think exercise helps in the first few months of healing but think that it might have some benefits later on if it is done gradually. From my own personal observations, it has to be exercise that is not stressful. My son had a long convelescence with PCS, and then gradually swam, played tennis and is now running cross country and a little weight training. He seems to come home bright eyed at 6PM, and he leaves the house at 7AM. On the weekends I make sure he rests alot. I think you need to provide rest and alot of laughs in between. This may sound silly but I do really think that it is the anxiety that exhausts him. Perhaps the exercise can increase the mental stamina in PCS? I really do not know but hope all can get back to it because it is so important to quality of life.
Nancy