Exercise is a critical component to getting healthy and staying healthy.   Everyone knows this.  Moving your body gets your all juices flowing.   Mostly importantly it increases blood and lymphatic circulation, both of which are imperative in the healing process. I exercised a lot in the first few years of my cancer diagnosis. Especially short runs and rebounding. But I didn't do much weight training... And I'm a little embarrassed to admit that I had a local gym membership that I've barely used in the last 10 years. CrossFit got me excited about working out again.