Marcus Bell of GRF Golf teaches how to eliminate effort and tension in the backswing by utilizing ground force and momentum. The video demonstrates how a 'push-off' from the trail leg initiates rotation and shifts the swing's low point forward. Through specific drills like the 'Drop-Pop-Drop' step and floppy-arm carousel, golfers learn to let the clubhead weight dictate the swing arc for a more effortless and powerful motion.