Daniel Strauss on Instagram: "Working the full range of supination. Supination, the movement of the hand from palm down to palm up, is a key movement of the elbow/forearm. It is trained often for injury prevention and muscular balance but also has benefits in sports performance, as well bicep development. The traditional way of training supination with a hammer is effective, but only hits half the movement. By combine it was an invert hammer supination you effectively hit the full range of motio