Allows an athlete to design and follow scripted audio or vibratory cues to start and stop individual repetitions. After a session, kinematic results such as the magnitude and direction of the differences between the Target movement and the Actual movement is stored and can be immediately available from the phone after each session. For example, an athlete could learn the if the lag time between maximum hip and shoulder acceleration occurred within the target margins of error, or not. The athlete then learns what different timing feels like, and can adapt accordingly.