Make the space safe
Secure the phone and leave enough clear room for the full movement. Keep people, pets and objects out of the path; use a wrist strap if you use a racket.
Try a no-ball review
Choose a coach-approved movement, rehearse it slowly, record the full body and compare one preparation or recovery cue.
Check transfer on court
Do not assume a home rehearsal transfers to ball contact or match play. Check it later on court.
