My husband was diagnosed about 5 months ago with Congestive heart failure, they advised us his heart is functioning at 30 percent. They ran test and assumed since he was a lil overweight he would have blockage, he did not. Although they put him on a fluid restriction diet, and advised o try to lose some weight he is fearful to do anything that may cause his heart stress. He has been wearing a life vest and so far no problems, his concern is what can he do to workout and what are somethings he can do if any to strengthen his heart?