Originally Posted by albesca
because the dragging doesn't add power, but by me, destroy the arm coordination.
Drive your car, hit the brake, car stop, you feel like you have an unknown energy push you forward. that energy is Kinetic Energy.
When you drag your arm behind, near contact body rotation slow down, the Kinetic Energy will push your arm forward if you keep a loose arm. Kinetic Energy need time to build up, therefore the idea of dragging emerges as an ingredient in Pull stroke: You pull the racket forward as Nick B. describe in his tape.