I am not going to spend time trying to elucidate some irrefutable reason why I feel overtraining is relevent. I am not that invested in being right.
Its a fact in my own training. You can adapt to train every day if the training is not too brutal and heavy and you can re-composition your look and get leaner but you wont add significant new tissue without adequate rest and food.
Steroids are not a 100 percent barrier against catabolism. Those aches and pains are your bodies signals, they should be obeyed now and then.
very hard to go catabolic when your on gear. Like i said not everyday is a super heavy day. some days are just high volume H.I.T style training and some days are heavy weight low rep days with one minute between sets sometimes two instead of 15-30 seconds on our H.I.T days. Training each muscle group just once a week is what alot of people do but I think people can push it harder if there on gear. specially groups like triceps and arms. I can easily break down on how to train arms three times a week . arms are a smalll muscle group so you should at least train them TWICE a week but THREE times is possible of course there is going to be a heavy day and a light H.I.T. pump day.
You can have one day where you train triceps and biceps, train back and biceps on another day and train chest, triceps and biceps. Legs is the only muscle group I can see training once a week but I can work them twice. one heavy low volume day and one pump day. our crew does full body work-outs some days. we just don;t get tired or get that sore. I will admit to painkiller use so that does help and I admit if I do get delayed muscle aches if I'm not using painkillers. This is why nubain got so popular. I'm not taking anything nearly as strong as nubain just suboxone but it has enough of a effect where you don;t feel as sore plus with the juice no problem training hard everyday and doing cardio everyday.