Originally Posted by Chas Tennis
What is happening that makes these ideas meaningful?
Couple reasons. Ash may provide more insight, but I'll give it a go. First off, when you hit a low volley, you're farther from the net. So you want to be moving continuously through the shot. With a higher volley, you tend to be closer, so you want to check your momentum. Also, low volleys need to be hit up and over the net, so you need that continuous momentum. If you land on your front foot before you hit the ball, you'll stumble--try it. With higher volleys, you want to hit down, so you need to slow your momentum down. Otherwise, you'll push the ball long because you won't be able to hit down.