A wrist exercise apparatus, particularly adapted for use by an athlete such as a baseball pitcher, is disclosed. The exercise apparatus has a weighted, elongated, rectangular frame which is adapted to be grasped by the pitcher and moved in a simulated pitching motion. The frame includes side members, a weighted cross member displaced to one side of the plane in which the frame lies at one end, a wrist-backing cross member at the other end, and a transverse hand grip intermediate the two ends which is longitudinally adjustable to accommodate variations in the length of the user's hand.