I come from Czech republic. I am a former tennis player, tennis coach in club TK AGROFERT Prostejov at this moment. I played some qualification on ATP challengers when I was a junior and I have to say from player's view that the speed of my serve and my groundstrokes was the biggest problem with my game. ATP pros is playing much faster. I have been using the Tennis SpeedChain since 2015. My shadow forehand swings were before about 104 km/h, after only 3 workouts with Tennis SpeedChain my top forehand swing is 150 km/h now. My top service speed was 182 km/h, after only 8 workouts with Tennis Speed Chain my top service speed is 201 km/h! I had been taught for many years that going to the gym and lifting weights would add some add km/h to my serve and groundstrokes. I found minimal results and I did not notice any improvement in my service and groundstroke speed after a couple of years. While players like Federer and Nadal are able hit 175 km/h forehand and players like Roddick or Raonic 249 km/h serve. So how do you increase racket speed? The answer is pretty straightforward. The first method to increase racket speed is to optimize stroking technique. Besides technique there are exercices and drills you can do to increase your racket speed! Train with SpeedChain and Torso Burner! The faster you swing the racket, the faster the ball flies and the more powerful your shots become.