Abstract: A sports training device may be formed as a cuff that may be wrapped around a user's elbow. The cuff may be formed of a flexible material, such as neoprene, and may include a fastening mechanism, such as a hook-and-loop fastener, to close the cuff around the user's elbow. The sports training device may include an adjustable air bladder having a pump and a release valve. The adjustable air bladder may be positioned around the user's elbow and adjusted using the pump and valve mechanism such that air may be distributed within the sports training device. Accordingly, use of the device may avoid degrees of bending with respect to the user's elbow, such as when swinging a tennis racket.