* Scientific replacement appears in bold.
*original description does not appear in bold.
- Player should ready wrist joint to whip forward just prior to contact with ball. Hyperextension of dominant radio-carpal joint 270 degrees in the sagittal plane around the mediolateral axis of rotation, just prior to racquet and ball making contact. As racquet and ball make contact, the “whip” occurs. The whip is a fast flexion of the radio-carpal joint 90 degrees in the sagittal plane at the mediolateral axis of rotation.