Not a lift, the Sit-to-Stand Trainer actively assists the standing motion with support at the knees, trunk and arms. Using a counter-weight mechanism, it provides graduated support the coordination of the standing and sitting motion even in individuals who have not stood in years to enable safe, effective strengthening of weight-bearing muscles and assists in re-learning. Equipped with a weight stack and locking pulley system, the Sit-to-Stand Trainer is mounted on wheels and fits through any standard doorway so that it can be easily wheeled from room to room. It can be used directly from a wheelchair or the bedside.