Natural guys have almost identical gains timelines . Their muscles grow significantly when they first start lifting weights, but their gains are very slow and steady after this. In comparison, a guy on steroids will also experience the same growth spurt during his newbie gains period. However, the difference with steroid-users is that they'll stop growing after this…then all of a sudden will gain a huge amount of muscle again out of nowhere. They'll gain 50 pounds of mass easily, their muscles will blow up and there'll be no logical reason for it…other than steroids.