
The close grip pull up is a pull up variation and an exercise used to build the muscle of the back and arms. Specifically, the close grip pull up is used to build the lats and biceps.
The hand positioning of the close grip pull up assists in alleviating unnecessary strain on the shoulder that some experience when performing its wide grip counterpart. However, the closer grip does result in slightly more bicep involvement, which can take away emphasis placed on the lats.