As you know, I'm a big proponent of good footwork in the golf swing and feel it's the most overlooked and underrated part of a good golf swing. I saw a video for the Swing Heeler training aid and I think it gives a great concept of how to get the golfer to master efficient footwork.
I've been trying to read up more and more on 'ground forces' in the golf swing. I was watching a Sports Science who on Fox Sports Channel and they had a race between NFL Wide Receiver Dennis Northcutt and an ostrich. The Ostrich blew away Northcutt, a man who runs the 40 yard dash in about 4.4 seconds and Sports Science talked about how the ostrich has much great ground forces than a human being and that's why it's able to run faster.
As one poster on another forum stated, ground forces work in golf as well. If somebody was trying to hit a golf ball while standing on a sheet of ice they wouldn't nearly hit it as far as a golfer trying to hit a ball while standing on a grass tee. Anyway, here's the Swing Heeler video.
For more info on the Swing Heeler, click HERE.