With the proliferation of steroid, training, and fitness forums on the internet over the past years, the population has shifted from a few larger boards more out towards the hundreds (if not thousands) of smaller boards in existence today.
Also, the chat and drug-using environments tend to attract more people than the forums that usually require knowledge of actually doing difficult work. More people would rather shoot the shit, not unlike at a bar or frat party, or vistit in hopes of learning the drug secrets to a perfect physique with little to no work than discuss tedious training methods and difficult physical labor.
Dieting is difficult. Lifting weights is difficult. Injecting drugs is easy. Casually chatting about nothing is easy. The populations reflect this.