Defense kick to the rear is a full rear kick, and it's a heel kick. From side by side position, by the way this kick can be executed from more than one place, but this is are starting place. From this position this will be the kick. One more time, I'm going to cross, turn my back to the opponent, foot comes out, and I'm going to land continuing to fight forward. Five times low. Again. One. Again. One. Again. One last time. One. Now change sides. Just a little quicker. Again. One. Again. One. Again. One.