Pull Up Exercise

Assume an overhead grip on the bar, slightly wider than shoulder-width. With the arms relaxed and shoulders elevated up to the ears, contract the core and upper back as you initiate the pull-up. Aim to pull your chin to or above the bar level, driving your shoulders away from the ears.

Benefits of the Pull-Up

Stabilizing your own body weight will also recruit the muscles in your core.
Your muscles will still respond to the relatively heavy load that is your own body.