An adjustable hand exerciser preferably includes a torsion spring, a handle, a handle cover, an adjustment plug and a center plug. The torsion spring preferably includes at least one spring coil, a first spring leg and a second spring leg. The handle includes a first spring hole to receive the first spring leg. The handle cover includes a first pivot extension and a second pivot extension. The adjustment plug preferably includes a sliding plug and a thumb screw. An inner sliding perimeter of the handle cover is sized to receive the sliding plug. The center plug includes a plug hole. The center plug is sized to be received by an inner perimeter of the at least one spring coil. A pivot pin is retained in the first and second pivot extensions and the plug hole, such that the handle pivots relative to the handle cover.