Arms at the sides, lift the arms by the wrists up to chest level in front as you raise onto the balls of the feet. In unison drop the arms to the sides and drop onto the heels. Repeat a few times.
This is done to spread the Qi around so that it doesn’t get “congested” in the shoulders, arms and hands.
Note – Shaking the Qi out of the body is not the purpose of this move.