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When Sampras does the little hip dip, just as he is leg driving up, his left hip opens up and his shoulders stay cocked and coiled against the hip, and a crack the whip effect is created!
The same thing happens with the bh/fh groundies. Study the pros as they place their chins on their deltoids, coiling against their hips, which open before the upper torso opens, and the chin is still against the deltoid as the hip opens, and the shot is "dragged". Think of Soderling coiling or Delpo coiling their fh. The hip opens first, and the shot is "whipped". The string bed is "snapped back" towards their rear ends, as their wrists snap the shot off, and the racquet butt is faced towards not the net, but the side fence for a very quick/brief moment. The hitting face of the string bed faces the rear fence! The kinetic chain in effect, depends on the hips opening first. If the hips open the same time as the shoulders, the shots do not have as much kinetic whip. Those who master this effect, can hit 130mph serves, and 90mph groundies at will.
The same thing happens with the bh/fh groundies. Study the pros as they place their chins on their deltoids, coiling against their hips, which open before the upper torso opens, and the chin is still against the deltoid as the hip opens, and the shot is "dragged". Think of Soderling coiling or Delpo coiling their fh. The hip opens first, and the shot is "whipped". The string bed is "snapped back" towards their rear ends, as their wrists snap the shot off, and the racquet butt is faced towards not the net, but the side fence for a very quick/brief moment. The hitting face of the string bed faces the rear fence! The kinetic chain in effect, depends on the hips opening first. If the hips open the same time as the shoulders, the shots do not have as much kinetic whip. Those who master this effect, can hit 130mph serves, and 90mph groundies at will.
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