Trenorol
It you have to throw your entire body into each lift then you are using too much weight. I know that once you hit a certain weight with things like barbell rows you can't help but swing a little but keep it too a minimum. If you are doing any of these things then you need to lower the weight you are using on your back exercises. That is probably the number one reason why people can't feel their back working. Lift the weight and really feel your back on each rep even if you feel like a girly man it'll help your back training tremendously.
