Consider the ball's angle, your opponent's volley skills, and your own comfort with volleys. Step in to volley to apply pressure, especially if opponents have weaker volleys, or when you see a good opportunity to speed up the game.
This lesson is very useful if you want to become more proactive in your defense. Sven explains clearly when you should step forward to volley instead of always relying on the back wall. Understanding when to attack from a defensive position can really pressure your opponents at the net. He also gives great advice on court positioning and movement to make your net game more effective and win more points.
