give me an example of your workout
An example might look something like this:
Monday:
Bench Press 5x5
BB Row 5x5
Single Arm Standing Overhead DB Press 3x10
Cable Pulldowns 3x10
Abs 2x12
Tuesday:
Squats 5x5
Romanian Deadlifts 5x5
Step-ups 3x10
Leg Curls 3x10
Biceps 2x12
Thursday:
BB Overhead Press 5x5
Weighted Pullups 5x5
DB Bench Press Incline 3x10
DB Rows 3x10
ABs 2x12
Friday:
Conventional Deadlifts 5x5
Front Squats 5x5
GHRs 3x10
Split Squats 3x10
Triceps 2x12
That's just an example but should give you an idea. If I'm not doing something like this I'm generally doing a full body routine 3 times per week.
and explain what you mean
Here's what I meant about frequency above.
When we apply a stress to the body, have it be weight lifting, sickness, injury, etc... the body's actual state at first decreases, than it recovers back to baseline, then there's actually a period where it actually overcompensates.
In the case of muscle tissue and lifting weights... it's a multifactorial process involving adapatation of the actual protein comprising the muscle (Protein Synthesis), neurological elements (both central and peripheral), glycogen replenishment, and so on. Each of these factors respond according to their own scales in terms of rate of decrease in state, recovery to baseline, and subsequent over or supercompensation.
Graphically this looks like this, just in case you're a visual learner:
To repeat... there are a lot of "parts" involved in muscle adaptation to lifting weights and they all move along a similar curve pictured in the above link... but each happens on it's own timeline.
In this case of muscle growth, the desired outcome is more contractile proteins in the muscle... thus a larger muscle.
The once-a-week routines are based on the idea that all factors of muscle adaptation happen on the same timeline. Everything out there research-wise, and anecdotally, suggests that this is not the case.
Protein synthesis (what you're really seeking to maximize) peaks and returns to baseline within 48-72 hours after exercise. If you're only training a muscle once every 7 days, that means that protein synthesis is actually detraining for 4-5 days out of every week.
The once-a-week routines try to make up for this with a higher volume/intensity of work...but even so, protein synthesis always returns to baseline within 3 days.
What you're recovering from is a combination of neurological and mechanical damage to the system....which doesn't contribute a whole lot to muscle growth.
With that in mind, the ideal split would train the muscles based on that idea... to keep protein synthesis elevated, you'd need to train each part every 2-3 days. That's where the full-body stuff comes in. If you want to exploit the mechanical damage, you can extend that a litte, say every 5th day. But I wouldn't go any longer than that, barring recovery/unloading weeks.
The reason the once-a-week splits work in the "pros" is because of drugs.
Can you make progress training each muscle once per week? Of course. Anything is better than nothing, assuming it's not risking your health. As long as you're adding weight to the bar and eating adequate food, over time, you're going to have a positive adaptation from the muscle.
I'm simply talking about optimizing the specific adaptations we're concerned most about in relation to muscle growth.
Ive heard train to failure, Ive heard do a lil here and there.
Training to failure often, especially while dieting, isn't a good idea. It contributes nothing to muscle growth and is more a neurological phenomenon than anything else.
The actual whys of this are quite complex but if you're interested in it, I'll certainly try my best to explain it to you.