Both lifters try to pull too far and too high on vertical pulling motions such as pull-ups and lat pulldowns. Rather than trying to touch the bar to your chest or reaching your chin over the bar (both of which can produce dysfunctional mechanics), the goal should be to achieve proper upper back and lat activation.
When I first approached corrective and performance exercise specialist Paul Chek about writing for Testosterone, his first concern was whether I'd choose to soft-peddle his article. In other words, he was worried that I'd try to "dumb down" his material.
Eric Cressey is like a Swiss cheese in a sea of Gorgonzola... oh, forget it. We were trying to come up with an analogy that was at least half as good as the training analogies Eric uses in this article, but we failed. Luckily, Eric was spot on.