The golf back swing is primarily about how your body is being coiled upwards thus creating the needed tension in the muscles as well as torque to be able to let out that all powerful down golf swing. Particularly, that the back swing is created anywhere in between the golfer's turning his or her upper body as well as shoulders and the turning - to a lesser degree - the lower body and the hips.

Source: Recreation and Sports: Golf Articles from EzineArticles.com