I have to disagree to a point. I spent a lot of time in the military back in the 90's and then again in the early 2000's. I never saw anyone with rhabdo going through selection and that was a crossfit like ball buster. Pushups to failure, sit-ups to failure, pull-ups to failure, rope climbs, runs, rucking and repeat over 3-4 weeks daily .I was so sore I could barely raise my arms to brush my teeth. Did I have a mild case of rhabdo, maybe. It was unheard of back then. I have only seen one case in my life and the person did it to them self. They stayed out partying, drinking, smoking (never done before), and dipping snuff (never done before). I have watched 1000's, and I literally mean 1000's, over the course of 3 yrs go through crossfit wods in a certain institution and saw only one case. I don't think crossfit causes rhabdo in and of itself. If you take a seriously untrained slob and teach the KB swing and they knock off 300 swings in a short time could they get rhabdo, maybe.