I want to throw another wrench in here and say it doesn't matter what a guy looks like when he is on,most likely he will look more muscular then when he
started the cycle. But whats more important is what he looks like and what he gets to keep after going off, meaning does he continue to eat and train hard to keep most of the gains.
Unfortunantly from what I have seen with people who jump right into juice thats not the case. Most of these type of people I am talking about go about it with this scenario.
1-Buy the drugs they want
2-set up a training program where they are training chest and biceps at least 4-5 times a week, everything else is trained maintenance because according to them those other parts grow too easy for them(sarcasm)
3-Increase protein intake to at least 1/2 a gram of protein per lbs of bodyweight
4-Increase meals from 2 meals to at least 4 a day
Now they go on the cycle train hard for the 6-12 weeks or whatever time the cycle is. Gain 10-30 lbs, 1 third water, 1 third fat, 1 third muscle.
Finish the cycle then they go back to eating and training like before the cycle, although truthfully they usually disapear from the gym for a few weeks only to retern looking worse then they did before the cycle.
I usually see this breed of "bodybuilder" during the late spring and summer months and in the weeks before spring break.