A posterior walker is disclosed comprising: a foldable, tubular frame; adjustable handles; wheels including anti-rollback wheels in the back and pivoting wheels in the front; a flexible, adjustable lower back support strap; features to adjust the handling and stability of the walker, to meet the mobility and standing needs of persons with unsteady gait and standing posture, namely an adjustable weighting means; and optionally backpack storage. In one embodiment, the adjustable weighting means is provided by use of weighted stability cuffs.