FROM TRAINER NATALIE HAGGLUND
Being stopped and balanced on defense as the hitter is swinging their arm.
The goal here is to put your body in a good position by reading the hitter's line of approach. Then getting STOPPED and BALANCED so that you are able to move in any direction that the hitter might hit to.
The key is to not take a "negative step" to the ball. Check out this drill run by VIBE Trainer Natalie Hagglund to eliminate those unnecessary steps.
If you see the athlete moving before contact, throw the tennis ball in the opposite direction so it becomes evident that they were "guessing", leaning or moving before contact.