WANJIA FITNESS Chin / Dip Assist, distinguished by stylish design and comfort, It gives the best combination of easy use and effective training offered by existing selectorised equipment. Designed both for beginners and for expert users, this line guarantees exceptionally comfortable exercising.Your biceps help give you strength as you bend the elbow. The upper back muscles of the rhomboids, lower trapezius and the teres major help the lats with pulling the arms down and back. Both the pectoralis major and pectoralis minor, the muscles of the chest, assist with the lifting action.