A support device (5) arranged to be removably secured to a user and having vertical (16) and horizontal (18) members. In one arrangement, a lower support assembly is arranged for attachment to the user's leg so that the support device assists the user in lifting the leg while taking a step. In an alternative arrangement, the lower support assembly is attached to the lower trunk of the user so that the support device assists in straightening the user's spine. The spring assembly (10) can be arranged to apply forward torque to the lower support assembly (8) relative to the upper support assembly (6), for leg lift assist, or backward torque to the lower support assembly for spine straightening assist.