An exercise device including a frame including a base frame and first and second posts extending substantially orthogonally from substantially outer ends of the base frame, a first platform rotatably connected to the base frame and selectably lockable in at least one position. The first platform includes a curved track mounted on the first platform such that a lowest point of the curved track is substantially near a center of the first platform and a pair of high points are located substantially near opposite outer edges of the first platform. A rolling mechanism is configured to ride on the curved track. A second platform rotatably mounted to the rolling mechanism is selectably lockable in at least one position. Such an exercise device provides multiple ranges of motion designed to provide an abdominal exercise that targets various different abdominal muscle regions, and may also provide an aerobic and/or cardiac workout.