Originally Posted by sundaypunch
If you hit with heavy topspin it is a bit safer to hit really hard.
I think everyone is saying the same thing, but using different words-
Obviously most people do not play well hitting the ball as fast/hard as they can on every stroke.
However, I swing with close to 90-100% effort on most shots ground strokes/serves. I am just putting a lot energy into brushing the ball. I will flatten out my stroke for bigger shots. And obviously I use less effort on touch/slice shots.