Abstract: A user propelled vehicle comprises a seat frame, a back pivotally connected to the rear of the seat frame about a first pivot axis and a leg support pivotally connected to the front of the seat frame about a second pivot axis parallel to the first. A support surface engaging roller is provided on each of the seat frame and the leg support. The leg support and the seat frames can rollingly approach and retreat from one another along a floor or other support surface between a contracted position, in which the seat frame extends forwardly upwardly and the leg support extends sharply forwardly downwardly from the seat frame, and an extended position, in which the seat frame extends approximately horizontally and the leg support inclines relatively gently to the frame. A hydraulic linkage is provided for maintaining the vehicle in the contracted and extended positions and for maintaining the back in positions extending sharply upwardly from or relatively gently inclining with respect to the seat frame.