I've found that if you put the band around an upright, like that on a power rack, and then do the pull aparts, the band exerts more of a force directly on the rear delt and upper back, rather than having the resistance stretched across your chest. I find this improves the exercise, and also you can make the exercise have greater resistance simply by stepping back from the upright.
The original post from The P&B:
http://powerandbulk.com/phpBB2/viewtopic.php?t=30840
Band Pull-Aparts are a regular part of many lifters "prehab" routines. A simple way to improve the line of the band's resistance (which stretches across the chest) is to do band pull aparts with the band on the other side some sort of upright.
Instead of the resistance going right across your chest, it'll be at some kind of diagonal to that plane. This is also an easy way to make them tougher, just by stepping back.
Picture a triangle. The bottom is your arms pulling the bands back. The sides are the bands, and the pinnacle is the upright the band is put behind.
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