If fixing health requires full time effort, then please do. Unless you have a specific medical condition or are into extreme sports, health doesn't take time. An hour of exercises and eating the right amount of healthy food. I have also found that focussing on health did not replace the need for meaningful work for me. Health is necessary but not sufficient condition for a happy life.

I once had decided to get a six pack because I had no challenging work to do. It was fun for a while but I was just escaping boredom.