Swiss tennis player increases forehand racquet speed 19 mph in 12 minutes with the Somax Power Hip Trainer ( http://www.swing-speed.com/tennis.php
) The 16:1 ratio between the hips and the racquet head means that any increase in hip speed will be multiplied 16X at the racquet for the forehand, backhand and serve.
The Somax Power Hip Trainer is 50 lbs. of commercial-grade rugged steel with baked-on black enamel finish for years of use. It includes a DVD with 26 drills for right and left hand use and comes with a 30-day money-back guarantee and a one-year warranty on parts.