PHTC

http://www.feeltennis.net/contact-point/ While tennis technique, meaning the mechanics of the stroke, are crucial for beginners to acquire some basic skills, it's not the answer for hitting powerful shots. You can only hit with effortless power and control if you hit the ball in your ideal contact point.

http://www.feeltennis.net/weight-transfer/ If you transfer your weight into the ball as you hit groundstrokes and volleys, you'll hit with more power as there will be greater momentum transferred into the ball. Of course, that's true for the neutral stance when you step in the ball.

http://www.feeltennis.net/late-on-deep-shots/ You've all heard the phrase "prepare early" to avoid being late on the shot (forehand or backhand usually) but that in fact doesn't work. The reason why you're late is because you want to see the ball after the bounce and thus you wait with the stroke.

http://www.feeltennis.net/how-to-deal-with-fast-balls/ When you're receiving a fast ball in tennis and you're hitting a groundstroke, you may be late on it often. The main reason why that happens is because you want to see the ball well after the bounce and that's just not possible.