Pull-ups are a core training exercise for most climbers. The grip position used in a pull-up has a significant impact on which muscles are being used and therefore being strengthened. Understanding the anatomy and biomechanics of the different variations of the pull-up can help you more specifically target your strength training for specific muscle groups and movement patterns. This is particularly important for athletes with shoulder and/or elbow pain to ensure you are loading the different structures of the arm and shoulder appropriately.