An exercise device for the crossover step, including an upper wheel supported, the upper wheel having a skating surface and being rotatable; a lower wheel joined to the upper wheel via a hub, the lower wheel having idler wheels supporting the upper wheel; upper legs and lower legs, the upper and lower legs being joined to the lower wheel; a track joined to the upper legs and lower legs, the track adapted to allow the upper wheel, lower wheel, upper legs and lower legs to be stored vertically against a wall and positioned for use adjacent a floor; and mechanism for controlled increase of simulated G-forces applied to a skater skating on the skating surface.