Originally posted by: sonambulo
get the two 45 pound dumbells and set them up like you would a bar on the ground. now deadlift them up to a full stand. the idea is to hunch forward slightly (do NOT round your lower back) and hold the 'bells until your fingers simply give out. for the first few weeks dont worry about using lots of weight or anything. just get the stance correct (ask a trainer if you're not sure).
as you get stronger, first wrap the dumbell handles with towels. after you've gotten good with that, go up in weight, keeping the towels. they make the 'bells a LOT harder to grip and will beef up your forearms in no time.