Disclosed is a putting practice device configured to enable training of keeping a putter face square without checking movement of a golf ball, to enable training of controlling putting strength as well as keeping the putter face square, and to enable training of practicing linear motion of a putter during execution of a putting stroke while an actual golf ball is struck. The putting practice device for the training of keeping the putter face square and controlling the putting strength includes an advance groove, a base plate, a striking part, an impact sensor, and a display part.

A sports rotation swing training system is provided that includes a harness assembly to be worn around the torso of the player that is used with a separate vertical upright structure. The harness assembly comprises a chest/waist band and a generally horizontally projecting stick protruding from the band side. The projecting stick is designed to engage with the separate upright structure upon the player's execution of a swing to provide feedback (auditory, tactile, or electronic) related to the degree of rotation. The chest/waist band can be alternatively positioned by the user at the chest (to practice thoracic rotation) or at the waist (to practice pelvic rotation). In a preferable aspect of the invention, the angle of the projecting stick is adjustable downward from generally parallel to the ground.

A golf club comprising a golf club head having a face wall, an inertial motion unit (IMU) positioned within the body, and a transceiver in communication with the IMU, a shaft attached to the golf club head, and a grip attached to the shaft is disclosed herein. The IMU identifies an impact location with a golf ball.

A golf club head comprises a body defining an interior cavity, a sole defining a bottom portion of the golf club head, a crown defining a top portion of the golf club head, a face defining a forward portion of the golf club head, a rearward portion of the golf club head opposite the face, and a hosel, the golf club head having a topline along a face-to-crown transition at the forward portion of the golf club head. The golf club head can comprise an electronic display positioned along the face-to-crown transition or wrapped from the face on to the crown. The electronic display can be sized and shaped to display an image that changes a position of the topline along the positive y-axis from a perspective of a user of the golf club head when the golf club head is in a normal address position.

A golf club head can include a body defining an interior cavity, a sole defining a bottom portion of the golf club head, a crown defining a top portion of the golf club head, a face defining a forward portion of the golf club head, a rearward portion of the golf club head opposite the face, and a hosel. The golf club head can have a topline along a face-to-crown transition at the forward portion of the golf club head. The golf club head can further include an electronic display positioned along the face-to-crown transition of the golf club head. The electronic display can be sized and shaped to display an image to a user of the golf club head when the golf club head is in a normal address position.