A longtime competitive shooter and firearms instructor for the LAPD developed Trigger-Master out of a specific need to strengthen a shooter's trigger finger while keeping the rest of the hand in a comfortable pistol grip, simulating the shooting position as closely as possible. The Trigger-Master exercise device for shooters isolates the trigger finger to simultaneously build trigger finger strength and trigger control. Tested under controlled conditions by both police recruits and competitive shooters, this device has proven itself to be an extremely effective tool in improving overall shooting ability. It has been designed to fit any size hand.