A quote from Gerry Hogan.......
"As every engineer knows, if you pass energy along a transmission chain, you will lose some of it at every coupling or joint. Now, in purely mechanical terms, the joints of the human body are extremely inefficient at transmitting energy. As a result, as much as 90 per cent of any energy you generate by a movement of the legs or hips would be lost by the time it reached the golf club. Somebody once calculated that about 4.5 horsepower has to be generated at the clubhead in the course of an ordinary golf stroke. So, if this were to come from the legs and hips, the legs and hips would need to generate more than 50 horsepower to begin with, given the heavy loss in transmission. The idea is ludicrous. Only the legs of a superman would be capable of such a feat."