CrossFit consists of three general modalities: weightlifting, gymnastics, and mono-structural movements. Weightlifting refers to lifting external objects or weights like power lifting or Olympic weight lifting. Gymnastics is moving your body weight through space. Calisthenics is another term that can be used to describe this, examples would be a bodyweight squat, push up, pull up, and sit up. Mono-structural movements are what most people commonly refer to as...