gymast's probably train every thing everyday

Gymnasts do indeed look great for not being on steroids or at least not on non-stop heavy bodybuilding cycles. Leroy Colbert is an advocate of training every muscle every day as well. He says the current 1x week training can't work without steroids.
I personally also got my best results when I knew nothing about 'bodybuilding training' and just went to the gym almost daily to do about 1 exercise per muscle group.
I'd say try it, what have you got to lose? Muscle perhaps but if you're visually losing muscle, just quit and go back to less frequent sessions. Obviously you don't want to kill yourself in the gym while doing this (which you really shouldn't be doing anyway). Train smart, not hard. Never seen a big guy train hard, seen many small guys go balls out all the time. It's sad but true, most of the time the most hardcore trainees are the smallest as well.