This is a short section of that (unedited) article:
Principle 5. Ideal training frequency
Training frequency per body part is the ‘‘single-set vs. multiple sets’’ of the 2K years! In the late 70s and early 80s the raging debate was between proponents of single-set training (low-volume) versus those who preferred the high volume approach. It was Arthur Jones vs. the Weiders; Mentzer against Arnold. The debate was never truly settled because in some regard both camps were right. But at the same time none of them actually possessed the universal and indisputable truth.
The fact is that both low and high volume training have their own pros and cons and can thus be used effectively given the right circumstances.
The same could be said about training frequency. Just like with the volume debate did, the frequency one rages on and I can guarantee you that we will never settle it and find one camp to be the victor and the other the loser, for the simple reason that both absolutist sides are right… and wrong!
There is no such thing as a perfect training frequency per muscle group. Only optimal training frequency based on the other training variables (volume, intensity, density, type of exercises, etc.), your lifestyle (60 hours a week job vs. unemployed, manual labor job vs. desk job, lack of sleep vs. proper sleep, great dietary habit vs. bad ones, etc.) and your recovery capacity. There are, however, some broad guidelines that can be used to select the optimal training frequency that you need to use (yes… it is about finding what is optimal for you, not what an author or coach believes is universally perfect for everybody).
Some of these guidelines are:
The harder you work a muscle group during a session, the longer it will need to recover. So if you typically perform super draining workouts (either via high volume or intensive methods) your training frequency per muscle group will need to be lower than if you do not kill the muscle every time you hit the gym.
The more muscle damage you create in a session, the more recovery time will be needed before the trained muscle(s) can be hit hard again. Muscle damage is mostly a function of mechanical work and eccentric loading. The rep range where the most damage occurs is 8-12 reps/set (or sets lasting 30-60 seconds with a heavy load) and when the eccentric portion of the movement is emphasized (either via slower eccentrics, accentuated eccentric methods or eccentric-only training) the damage is also greater. This is why olympic lifters can train on the competition lifts 6 days a week: in training, olympic lifters rarely perform more than 5 reps per set (most sets are for 1-3 reps) and the eccentric portion is all but eliminated because the bar is dropped to the floor at the end of every lift. Low mechanical work plus no eccentric equals the capacity to train the lifts extremely often.
Training frequency is also dependent on the level of nervous system fatigue that is induced during each training session. If you do not tire out the nervous system, you can obviously train more often. However at some point the CNS must be challenged if it is to become more resilient.
The more often you can stimulate a muscle without exceeding your capacity to recover, the more you’ll progress. Two things are important in that sentence: you must actually stimulate the muscles to grow. Sure, you can perform a few sets of easy exercises, never actually challenging yourself, everyday (even several times a day), however if none of these ‘‘sessions’’ represent a challenge that the body is forced to adapt to, it doesn’t represent a stimulation. Then there is the aspect of exceeding your capacity to recover: you can be 100% convinced that super-high frequency of training is the Holy Grail of muscle growth, but if you are not allowing your body to recover, you will simply not progress! In other words you must strike the perfect balance between stimulation and recovery to progress optimally.
So what frequency do I recommend? Again, it is an individual thing. And it depends on training style and what is going on outside of the gym (i.e. This thing called ‘‘life’’). But assuming that you are training according to my new principles then:
‘‘The optimal training frequency per muscle group is 2 sessions every 5 to 7 days’’
Those with a good recovery capacity and/or an un-stressful life can aim for 2 sessions per muscle group every 5 to 7 days while those with an average recovery capacity or a more demanding life should shoot for 2 sessions every 8-10 days.
Understand that not every single muscle group absolutely has to be hit directly with this frequency. Indirect work (e.g. Triceps getting some work when the chest is being trained) can also be factored in.
If you are to hit each bodypart twice every 5 days; or in other words using a 3 days cycle with 1 day off, a good split could look like this:
Day 1. Chest/Back
Day 2. Lower body
Day 3. Arms/Shoulders
Day 4. OFF
Day 5. Repeat
If you are more inclined toward a ‘‘body part’’ split, or…
Day 1. Lower body
Day 2. Upper body
Day 3. Trunk (abs, lower back)
Day 4. OFF
Day 5. Repeat
If you are more of an upper/lower kind of guy.
These two options are for those with a great recovery capacity and not much life stress (got to have both things going for you).
If you do have either a good recovery capacity or little life stress then a 6 days cycle will be a better option for you. You can go with either one of these three options:
Day 1. Chest/Back
Day 2. Lower body
Day 3. OFF
Day 4. Arms/Shoulders
Day 5. OFF
Day 6. Repeat
Day 1. Lower body
Day 2. OFF
Day 3. Upper body
Day 4. Trunk (abs, lower back)
Day 5. OFF
Day 6. Repeat
Day 1. Whole body
Day 2. Off
Day 3. Lower body
Day 4. Upper body
Day 5. OFF
Day 6. Repeat
If you are average or below in your capacity to recover and/or have some life stress you should bump it up to a 7 days cycle. You then have these options:
Day 1. Chest/Back
Day 2: OFF
Day 3. Lower body
Day 4. OFF
Day 5. Arms/Shoulders
Day 6. OFF
Day 7. Repeat
Day 1. Lower body
Day 2. OFF
Day 3. Upper body
Day 4. OFF
Day 5. Trunk (abs, lower back)
Day 6. OFF
Day 7. Repeat
Day 1. Whole body
Day 2. Off
Day 3. Lower body
Day 4. OFF
Day 5. Upper body
Day 6. OFF
Day 7. Repeat
Day 1. Whole body
Day 2. OFF
Day 3. Whole body
Day 4. OFF
Day 5. Whole body
Day 6. OFF
Day 7. Repeat
Day 1. Pushing muscles (chest/shoulders/triceps)
Day 2. OFF
Day 3. Lower body
Day 4. OFF
Day 5. Pulling muscles (back/biceps/forearms)
Day 6. OFF
Day 7. Repeat