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Pull ups depend on the width of your arms, a wider grip is mainly working your lats, but they generally work biceps and back complexes. Try http://exrx.net/Lis

• icegreentea 16y ago
  Actually pull-ups and lat pull downs are often forearm/grip strength limited. In my case (and many of my friend's), I find that as my grip starts to fail, I have to work my back and arms even harder to transmit enough power. In fact, you can see this demostrated by trying to do pull-ups or something on a thick bar sometime. It will crush you. Captains of Crunch as mentioned by sister post is great stuff. There's also the really old school style of just carrying heavy stuff in your hands and walking around for a good while. Just remember that most grip strength exercises focuses on one of con/iso/eccentric movements, so you might need to mix and match. Also, depending on what you need, you'll have to mix up low rep high weight, as well as low weight high rep. With grip, it's not just a question of how hard you can pull, but really how long you can pull, and more importantly, how long you can pull while your forearms are -dying-, which is something you'll miss out if you did all low rep stuff.