For maximum power creation in the golf swing, with minimal negative stress on the body, the ground must be the first link in the kinetic chain of energy transfer.
Newton’s third law of motion tells us that using the legs to drive forcefully into the ground results in the ground pushing back up into the golfer’s body with an equal magnitude of force. The force the ground transfers into the golfer is known as the ground reaction force (GRF). GRF is then transferred up the kinetic chain, first through the legs and into the pelvis, then up into the golfer’s core, shoulder complex, arms, and, finally, the golf club and ball. Transferring this energy up the kinetic chain from the ground to the ball with the most efficiency is what allows you to create the most power (club head speed) your body will allow.
Everything we do is reflected in the ground. I currently use 2 pressure measuring platforms, Boditrak and Myswing 3D to help players understand their movement pattern and how they apply their bodies downward pressure to the ground.