The golf swing is like a tug of war. You are constantly offsetting the force of the club. As it starts to swing back you are pushing forward. Once the club changes directions you are again constantly pushing away from it. So your body becomes and offsetting and stabilizing force for the club. As the club swings through impact you are pushing back and away from it. The same happens throughout the follow through. This is something you do daily. Once you understand it the swing starts to time itself.