Patent ID: 8292760

Claim:
A system for controlling a user's baseball bat swing, comprising: an arm-mounted device that includes: an upper arm portion; a lower arm portion pivotably connected to the upper arm portion; at least one releasable attachment device carried by the upper arm portion or the lower arm portion and positioned to releasably attach to the user's arm; and an adjustment element operatively coupled to the upper arm portion and the lower arm portion, the adjustment element being manipulatable to control an angle between the upper arm portion and the lower arm portion; a light source carried by the arm-mounted device, the light source having a light emission axis that is adjustable relative to the arm-mounted device; and a stowable pad positionable relative to the arm-mounted device to receive light from the light source, the stowable pad having: a home plate indicator; a foot location indicator that is movable relative to the home plate indicator; a swing line indicator; a load indicator that is movable along the swing line indicator; and a throw indicator that is movable along the swing line indicator.