The disclosure herein includes an arm exercise assembly, which arm exercise assembly may include: a frame shaped and sized to receive a human forearm; a piston coupled to the frame; a bracket pivotably coupled to the frame; a wheel coupled to the piston and pivotably coupled to the bracket; two locks extending radially through the wheel toward inner portions of the wheel; and a handle pivotably coupled to the wheel, wherein the handle may be capable of being abutted against one or both of the two locks.