In a chin/dip assist, what...?

Question

If one grabs it by the widely separated bars, which muscles are more targeted? How about if the narrowly separated ones? Thanks

Answer 1

Chin ups are the best exercise to build upper lats.

Wide and close grip chin ups have remained the gold standard exercise for developing a strong muscular upper back... nothing compares to it.

Muscles targeted in WIDE-GRIP:

latissimus dorsi

teres major

pectoralis major, pectoralis minor

subscapularis

triceps

rhomboids

brachialis, brachioradialis

Muscles targeted in NARROW-GRIP:

pectoralis major, minor

deltoid

latissimus dorsi

teres major, minor

subscapularis

infraspinatus

triceps

trapezius

rhomboids

biceps brachii

brachialis, brachioradialis

So, basically the narrow grip chin up recruits additional shoulder joint muscles.  The deltoid, which is one of the main muscles that is responsible for many movements of the shoulder joint, is only used in the narrow grip chin up.