Welby Van Horn would use this technique to teach ballistic swing
footwork. Once you have made the ground stroke or serve or volley, hold
your follow through (or ending) to a count of “3,000”). Look at your feet.
Are your balance foot and adjustment foot correct as described in “The
Ballistic Swing” section?
“Balance is the clue to good tennis, and footwork is the clue to good
balance” –Welby Van Horn.