I used to do extreme workouts and I have a bad shoulder because of it. I’d work until fatigue, lose my form, and end up with overuse injuries. Stick to basics… interval cardio and strength training sessions. Lift heavy, with good form, and REST in between sets.
Check out the article:
CrossFit’s health hazards:From detached retinas to wetting your pants http://ift.tt/29NutuM