I never train my arms on a different day, because I could never see the sense. Normal back exercises knacker your biceps, normal chest exercises waste your triceps, so as far as I could see training arms on a different day would just muck up your recovery and repair. After chins and rowing you would be as well to do some curls and finish off your biceps. Similarly. you would be as well to do some tricep pushdowns after benching and the like. Of course, you can work back without hitting your biceps - Nautilus pullovers, shrugging, but not that well (IMHO). Anyway, I couldn't get to the gym yesterday, so I did some back and chest at home and did arms in the gym today. I don't think I'll be repeating it. I've always had a horror of breaking a bicep tendon, a pretty common injury. I hadn't realised just how useful, for me at least, it is to do loads of compound movements for your back before you do biceps. Having more oomph just meant I could be more aggressive on isolation exercises on the arms, and it didn't really feel good. I'd be interested to know whether people who injure their bicep tendon typically do it when doing arms alone, or at the end of back work. My guess is that being jiggered from back work prevents you from doing anything too stupid - even if from the point of view of pure stimulus there is a case to be made for doing arms separately.