One of the most informative golf web-sites on the internet is Greg Norman's site at www.shark.com. This site covers every aspect of the game of golf. One of the more interesting topics is the importance of being physically fit, especially for senior golfers.
Biomechanics, which is the role that different muscle groups play in the golf swing, is thoroughly explained in an easy to understand manner. This section goes into detail about how important a good warm up is prior to playing. There are examples given of various exercises that golfers can do to loosen up the important muscle groups specifically used in the golf swing. This web-site gets a 5 star rating and should be on your “must view” list.