For Pull-ups/Chin-ups I'm a firm believer in the wider the better.
I tore my rotator cuff back in high school though, so I can't use as wide of a grip on pull-ups as I would like to. So I just go as wide as I can for now, which is not very wide at all. But I do know that with a wider grip, you'll give your lats more of a stretch, and hence, give them a better workout. A narrow grip works the lats well too, but gets the forearms involved a lot. A narrow reverse grip will workout the biceps more.
Follow Killa_Z's advice: vary your hand positions and grips. Don't get used to just one type of position/grip.
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