The Sequential Order Happens in the Down Swing Face

"We're looking to generate more speed and power. What happens there is, yo, have newton's principle of action reaction," he says. "So when the thorax or rib cage fires, it has to push on something." So you'll immediately see a deceleration of the pelvis. And surprisingly enough, the pelvis and the rib cage don't accelerate all the way into impact. They actually decelerate a fraction of a second before because of the sequential firing action". The transfer of energy keeps on going down the chain until finally the wrists fire, decelerating the arm just before impact.