Chin-ups are a great all-around exercise for the upper
body and involve the latissimus dorsi, teres major,
rear deltoids, rhomboids, the sternal portion of the
pectoralis major, the lower portions of the trapezius,
and the elbow flexors. Chin-ups will not only add
width and thickness to your back but will also add
size to your arms with bicep, brachialis,
brachio-radialis and pronator teres development.
Parallel grip chin-ups
Increase the work on your rhomboids and lower lat region