No, other way around. Anabolic steroids will build muscle without weight resistance exercise. However, adding weight resistance exercise on top of intake will dramatically increase lean tissue gains.
The anabolic phase is a phase of body growth where a person is gaining weight, much of it lean tissue. It’s a chemical (hormone level) status in your body that occurs naturally if you overeat to a heavy degree. You will gain much body fat, but also a certain amount of lean tissue will be added to the body as a counterbalance. Add that with heavy weight resistance and you get a dramatic effect. It’s called the ABCDE or ABC system. I jumped from 165 to 180 in 6 weeks, about 1/2 of that being muscle. It’s not an advisable routine, though.
So if you can do that without the benefit of anabolic steroids, whether just a plain overeater or on the training system I described above, imagine what steroids would do for you.
OK, that is a bit over the top for the original thread topic, but hopefully that dispels the concept that anabolic steroids have to be used in conjunction with weight resistance training. That works for repairing injuries in horses (the original usage of steroids in sports), but why would a person do it (w/o training)?