The Chin up is a multi-joint exercise traditionally used to strengthen the muscles of the upper back (Latissimus Dorsi, Rhomboids) and the Biceps. This exercise is often used to develop strength for pulling movements.
http://www.nsca-lift.org/>videos/Chin%20Up/defaultchinup.shtml</a>
http://www.nsca-lift.org/>videos/Chin%20Up/defaultchinup.shtml</a>
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