Abstract: An exercise apparatus having a trolley directly linked to the resistance weights. Bearings on the trolley react against the eccentric component of an applied force, while a selector bar connecting the trolley with the weights interacts with the weight stack to keep the trolley bearings in continuous contact with upright guide rods on which the trolley and weights ride when a user withdraws his controlled grip of the press bar or the lat pull down bar, removing any externally applied force.