How I Stopped Sucking at Pullups | Eat, Lift, and be Happy.

http://www.negharfonooni.com/2011/12/how-i-stopped-sucking-at-pullups.ht
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Of special interest: the assistance exercises the author implemented,
notably the band supplement on one side. Excellent example of someone
who sees a gap in their training and works intelligently and diligently
to fix it.