Grasp the pull up bar overhead with an overhand grip just outside your shoulders.
Engage your shoulders by tightening your shoulder girdle to avoid stress on your joints.
In a controlled motion swing your head through your shoulders and your feet back to create some momentum.
Bring your head back through your shoulders and your feet forwards while starting to pull your body upwards to the pull-up bar with your arms.
While your body starts to travel upwards towards to the pull up bar aggressively snap your hip forwards to help you reach the top of the pull up where your chin reaches over the top of the pull up bar.
At the top of the pull up lower your body back to the starting position while maintaining a pendulum-like momentum and repeat.