My 21 year old son has been shunted since shortly after birth. He exercises daily. He does both aerobic and weight lifting. While he was in school he tool weightlifting classes. He was able to keep up with the routines and has continued weightlifting at the gym. He has been fairly active for the last few years and fortunately never had any problems associated to his exercising. In any case, if you have not been active for a while, it is always smart to start slow and build up your routines gradually.