In this video, I explain how to block both high arc topspin attacks and low, fast topspin attacks.
You need a slightly different blocking technique, depending on what type of attack your opponent makes. If it is a high arc topspin attack, you need to close your bat angle, contact the ball early and use a slightly more active stroke.
If it is a low, fast topspin attack, you should open your bat angle slightly and try to stop the ball. The ball will go back fast, and you will often hit a winning shot.
At the end of the video, I also ask how much we should block when we play.