Improve by ensuring you have enough space from the ball/glass, using quick footwork, preparing the racket early and low, waiting for the ball to drop, and hitting in front of your body.
This is quite useful if you struggle with hitting the ball after it comes off the back glass, especially on your backhand side. The coach focuses on fundamental adjustments that make a big difference. Pay attention to the tips on distance and timing, as these are common challenges for many players. Applying these corrections can significantly improve your defense from the back of the court.