Thrusters are a very good exercise for training full body power generation. The exercise can be done with one or two weights with anything from a kettlebell to a sandbag used as the weight. The strength of the legs are primarily tasked during this exercise, but the core, paraspinals, and arms are also put to use during each repetition. The point of this exercise is to train the body to work together to generate power rather than muscles in isolation. This more accurately represents how the human body works in everyday life and in athletic events.