Ive always heard "whatever you can recover from"..

I followed Arnold's book that recommended this some 10-12 yrs ago and saw tremendous results all natty in regards to both growth and strength gains. I don't do it now as it's boring and I really like a HIIT style training regime. I hate cardio for the sake of cardio and just weightlifting without variety and intensity is too monotonous. I've taken to participating and training with the Civil Air Patrol in my area and I'm very happy with it. Long to short? To each there own goals.

I think it varies for everyone. for me I don't feel like once a week is enough. I also think you'll be able to tell if you're doing too much, i.e. sore and tired, but I could be wrong. There's also a lot of variables, like how many sets per body part per workout vs how many sets per body part per week. also, something I heard once that always made sense to me - "there's no such thing as over training just under recovering."

Everyone is different and many factors come into play when discussing recovery time.
The standard in science would be 72 hrs of recovery per muscle group. ex: train chest on monday and friday.

I find adding more intensity and less training days works best for me. I do a 3 days on 2 days off approach

"You only live once, but if you live/do it right....once is enough"

It's all boils down to balance in a way, and finding that balance is key. You want to stimulate the muscle, not annihilate it. As per relative to AAS usage...more isn't always better and push too much, too often for too long and the body itself pushes back... HARD and you end up back in square one having done more negative damage than positive/good. Periodization works and very well, but one must fully adhere to the plan and follow it to the T. Its difficult to sometimes have to "hold back" aka deload especially when improvements are being made left and right.(Chuck Vogelpohl) Before you realize it, injury occurs as as a result of "not listening to our body" and by then it's too late and starting from scratch is never fun. "Balance" Good luck

It all depends on what you can recover from buddy - in terms of muscle soreness, CNS fatigue, energy levels etc. With both Bodybuilding and Powerlifting for example the more times you are able to train a muscle per week then the bigger and stronger it will become. That's where your Elite level guys take home the winning prize in both sports - because they can recover extremely quickly and therefore get more work in during a given timeframe, heal & recover it then hit it again because they have top level Genetics. Its also where different steroids and cycles come into play as on some you can increase the frequency more than on others. However its all a very delicate balancing act as there is a fine line between high frequency and overtraining. Once you are overtraining you are effectively destroying the muscle and making it weaker and smaller. Keep in mind a Week doesn't have to consist of a set 7 days, it can be effectively 9 days to you and you can train everything twice in that period.

A good training program is the key make a 12 16 week split training 1/4 4/8 8/12 12/16 put in variation one exercise with drop set one exercise focus on squeez/stretch one exercise focus on negatif and explosion one to failure and dont forget a proper warm up

One thing for sure, I can only do legs 1x every 5 days but I’ll do (touch up) days on various body parts just to activate that group. As far as legs go, I do try to hit the staining master at a slow pace to stimulate that muscle group but typically yes all my body parts are once a week with incorporated warm ups with other muscle groups for a few sets.

I’m all ears on this was. I just switched to twice a week two weeks ago, and see and feel a difference already. New diet probably has to do with it too.

I know Arnie used to sometimes hit chest twice per day with a beach visit in between. The life !
Once per week depending on number of sets is enough for me at my level but it’s all about recovery. At 41 I go hard but take it easy at the same time. Like someone else said in another post ‘ slow and steady ‘

Read one of makwa's post for bulking, and about hitting same body part 2x day. I tweaked it some, just don't have time for 2x a day sessions. Been hitting same muscle every 2 days back to back at gym, been doing this the past 2 weeks and it fuckn rocks. Was hitting different muscle group everyday, would get sore and pumped but not like hitting them back to back I'm going to stick with that for a while and rock it. look up his post for bulking.

All depends on your experience.. Someone like me. Hell no it isn't enough. someone who walked into gym for first time. Yes. If you are not growing, then reassess diet. Still not growing then reassess training regime. I have some routines where I work one body part everyday of the week.

I hit everything at least twice a week. Sometimes 3X depending on what I want to do goal wise.
I run a variation of push, pull and legs split. I throw in an extra body part here and there.
I work some muscle groups harder than others as it takes a bit more to stimulate. Say my back gets worked harder than arms do.
There's a plethora of information on here. someone will chime in.