Anyway, i thought of that when I saw this piece of research. It is about golf, but the principle is the same.
"Up until now, the evidence for 'loading the hips' has all been anecdotal," says Dr Su Stewart , who led the research. "Coaches emphasise it, and certainly any golfer can feel the tension the movement creates. What we have shown is how closely this relatively small movement correlates with increased angular velocity at the club head. A great golf drive is not simply about creating torque by rotating the body around the spine, it is also about creating torque within the hips by rotating the pelvis around the right hip joint itself."
In the study, eight right-handed male golfers with handicaps below five were tested in the laboratory with a variety of techniques including an array of 12 motion-capture cameras and 39 reflective markers (35 on the participants, four on the club).
When the results were analysed, significant correlations were found between club-head angular velocity at the moment of impact with the ball and left and right maximum hip moment. What's more right-hip torque was significantly correlated to swing intensity both at the top of the backswing and at mid-downswing showing that the right hip is instrumental in initiating and driving the downswings that achieve the greatest distance and so suggesting new avenues for both research and coaching.