Apparatus for exercising a user's muscles and providing the user with a cardiovascular workout. The exercise apparatus includes a base having two concentric circular closed tracks and a platform for supporting the user, wherein the platform comprises a turntable and four rollers which glide along the tracks of the base. The platform is adapted to rotate about a first axis and to concurrently move linearly along a second axis. The exercise apparatus optionally includes a resistance mechanism for opposing movement of the platform. Also optionally included is a hand rail surrounding the platform which may be detached from the base when the apparatus is not in use.