A walker having four substantially straight elongate members each having upper and lower ends and a spacer assembly for keeping two elongate members at a parallel and spaced apart relationship with respect to each other. The other two elongate members are each mounted to a handle member defining two spaced apart U-shaped assemblies. A removable seat assembly adjustably positioned at predetermined heights so that a user can walk while seated to relieve his body from the weight stress. Optionally, a reinforcement base assembly is used to provide greater structural support for the walker. The walker can include arm rests and an adjustable frame to cooperate with users of different dimensions. The walker can also be collapsed for storage or transportation purposes using hingedly mounted elongate members and a pivoting U-shape base assembly.