The Secret of Golf edited by George Peper

[toothjockey]

In The Secret of Golf, which by the way, has a chapter on the Golfing Machine, there is a secret discovered by a cartoonist who studied the baseball swing of Mark McGwire. He says that both arms don't swing into the baseball or golfball at the same speed, but the left arm should pinch backward against the torso at the moment of impact. How does that stack up with golfing machine principles?