absolutly nothing wrong with machines, esspeically hammers. With my training, I am switching up my routines everytime I train a muscle group. what I mean by that is...Say today is chest day, and maybe I'll hit, incline bench, flat bench dumbell presses, decline hammer and weighted dips. Well, NEXT time I train chest, Ill change that up and do maybe flat bench, incline bench, incline dumbell presses and seated flys. I use the "shock method" that arnold used and I love it. Works well for me and my body never gets used to doing the same excersises. But I do work in machines. Machines can help you isolate and target a specific muscle you are trying to train.