Abstract: An athletic glove conditioning system comprising a hand member adapted to be fitted inside a new baseball or softball glove and a mechanical apparatus for causing a repetitive movement upon the glove while the hand member remains therein. The hand member includes a thumb piece pivotally connected to rest of the hand about a pivot axis selected to simulate the catching movement of a human hand, as when a baseball player is catching a ball with a glove. The mechanical apparatus has a pair of upwardly projecting arms provided with clamping devices for attaching to the thumb and finger portions of the glove. One of the arms is coupled to a drive mechanism to oscillate toward and away from the other arm. In use, the glove flexing apparatus causes the glove and the hand member therein to oscillate between open and closed positions, to simulate a repetitive flexing movement thereupon and thereby soften the leather along the appropriate places to permit better control by the user's hand.