Abstract: Exercise device for a sporting device, including at least a fixed structure and a movable element and optionally a mass hanging from the movable element, wherein: a) the fixed structure, extending at least partially longitudinally along an axis X, is connectable by way of an end portion to a portion of a rod of the sporting device, this structure including at least one limit stop positioned at the free end or between the free end and the movable element, and b) a movable element connectable to the fixed structure and adapted to carry out at least a sliding translation movement with respect to the fixed structure along the axis X.