 Exercise? Do high intensity, low force exercise with plenty of recovery. What Skyler told you is gospel truth. You can read my book, Body by Science. First, do no harm. Find Bill Day Simone's work and read it. Moment arm exercise. You don't want to injure yourself either. It's not enough not to be sick. You tear your rotator cuff, guess what? You're in the belly of the beast. So you should avoid ballistic exercise or programs that use skill-based movements in a fatiguing protocol. I love the spirit of CrossFit. I love the notion of doing hard things builds character. But what I don't love is a fatiguing protocol with skill-based movements that are going to get you injured. Same thing with P90X or Insanity workout. Do high intensity, low force workouts because injury will put you into the belly of the beast very quickly. Remember, when you're becoming superhuman, the way to do that is to remember you're only human.