Abstract: Exercise apparatus comprising a support, arranged for supporting a standing person, and an axle including a guide roller, arranged for providing guided rolling support to the support, at least one wheel member and an axle support, wherein said apparatus further comprises an axle twisting member arranged to cause the axle to twist about a second axis, lying across a first axis disposed along the length of the axle, in response to rotation of the axle about the first axis, caused when the support is moved across the axle in guided rolling engagement with the guide roller.