In the dog world this process of domination and control is serious business, usually employed when the puppy has done something seriously wrong. Make sure you let the puppy know he is forgiven and back in your good graces when the exercise is done. I didn't have a puppy available at the time. Place the dog in front of you, and position your arms so you can grab the rear legs near the paws, while cradling the dog with the left arm. Grab the inner leg, the one closest to you with your right hand, and then pull it away from you as you gently lower the dog's head to the floor.
Surprise is often the key with puppies.
Plop them on the floor as fast and as safely as you can. With the dog flat on the floor, near the paws grab both the legs that are closest to the ground., and very quickly place your left arm across the neck of the puppy, pinning him to the ground. Expect a ferocious struggle the first couple of times. Hang on for dear life and use all your body weight if necessary. If the puppy continues to struggle after being pinned, lean down and growl in as deep a voice as you can.