Malaska Golf Certified Coach Matt Baker reviews the M-System M3: Slap Drill.
This is a wonderful drill that is flexible enough to do anywhere. It helps Matt organize his body and how he uses his shoulders and chest correctly. It also helps with the body motion of his hips and legs. The Slap Drill gets his hands and arms on the right path and helps with early extension.
Matt gets into his golf stance and has both arms out in front with his hands against each other. He swings his right arm back and feels his chest stretch and shoulder blades contracting together. At the same time, his right hip is pushing back with his right leg. From there, Matt can keep his spine angle correct, feel the pressure on his right heel, and start pushing into his left leg.
Matt then brings his right hand down from the top to slap his left hand out in front. This helps Matt to organize his swing. As Matt hits his left hand, his right arm is lower than his left as he is lining up to the "shaft." Matt feels the pressure of slapping in his other hand as his hips push away. From there, Matt's left hand completes the swing on the follow-through, and his right hand stays in the center. Again, he feels his chest stretch and his shoulder blades contract when his arm goes up.
Matt concludes that this is a great drill if you struggle with the concept of body action.