I haven't seen the movie and probably should do it, but I absolutely loved this write-up about it. Check out these excerpts:

All the same, if anyone wants to watch naked men in the shower, naked men doing erotic dancing, naked men in bed and almost-naked men pumping iron, this is the film to see.
There are moments in "Circuit" that are so bizarre and revealing that they have to be based on an insider's perspective. At one point, Johnny, the most reasonable of fellows, is about to go to bed with a man he really likes. But he can't bring himself to do it. Having just given up steroids, he knows he has some flab on his body, and he can't enjoy sex knowing he has flab. If straight guys worried about that stuff, the human race would die out in a century.