I've read up on steroids before because I was tempted to use them. From what I understand, steroids are a boost of the male hormone testosterone. Its the testosterone that gives you that manly muscular look and is responsible for your muscle curvature. This gives your body a boost of it apparently and so therefore your body has the ability of pushing more, performing more. I think it was something like a 33% boost in power and stength. But I read that after you stop taking the steroids your body goes back to normal and you are back to square one and so you have to stay on the steroids. Then you're hooked.