Abstract: A training device guides the throwing arm of a person in a ball throwing movement in a forward throwing direction. The training device comprises a base arranged to be supported on the ground, an upright support member extending upwardly from the base and a guide member on the upright support member which has a generally concave inner surface extending upwardly and forwardly from a generally vertical starting end to a generally horizontal releasing end. The user grasps a ball in the hand of their throwing arm and displaces the ball alongside the guide member from the starting end to the releasing end in a ball throwing movement to throw the ball in the forward throwing direction of the training device.