Quite the opposite. It is medical fact that the kind of exercises build your immune system, making it you stronger and less susceptible to other illnesses. Of course, since cancer treatments often lower white cell counts, patients must be careful about exposing themselves to people and places that carry disease. However, doing moderate exercises in the safety of your home does not put you at risk. In fact, it will stimulate blood flow, increase range of motion, release endorphins, all of which will enhance your physical and emotional well - being.