What type of exercises cause the most injuries? It has been shown that weight training causes a hefty portion of sports injuries and some can be permanent. There is very little need to do more than isometrics and isotonics for muscle tone unless your dream is to be a competitive body builder or you’re sold on a very muscular “Macho” image. Flexibility derived from exercises like yoga and swimming, and aerobic exercises like Prancercise®combined with spot isometric and isotonic exercises, can give a person a well-rounded and fit body. I personally use light ankle/wrist weights during Prancercise® and during my pre and post preparation for it.