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Simple guidelines to design your ownfitness training program
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The Set/Rep Bible How to use the "24-50 principle" to achieve your goals!
by Chad Waterbury
This Internet is a dichotomous sumbitch. On one hand, Internet information sharing has enabled
us to read loads of articles pertaining to training and muscle growth. On the other hand, less
credible advice accumulates into a sea of confusion. It even confuses me, and this is my
profession!
The problem is, how do you know what info is credible? Specifically, what models are used to
determine a prescribed set/rep range for any given goal? Scads of parameter variations have been
prescribed over the years. Most trainees blindly accept these parameters based solely on creative
writing skills and underhanded marketing schemes.
To address this issue, Im here to provide some useful, simple guidelines to design your own
program. As such, its time to quantify certain parameters that Ive found most efficacious.
The 24-50 Principle
The 24-50 Principle was born when I figured out that certain minimal and maximal set/rep
volumes are necessary for various structural and neural effects. Indeed, based on the intended
goal, Ive devised certain key set/rep volume ranges during each microcycle.
Even though "assisted" individuals can withstand more volume and intensity (more of the former
than the latter), its not always necessary or desirable. As such, both natural and assisted trainees
can reap the benefits of this information. With the simple application of the 24-50 Principle
youll be able to:
1) Determine which set/rep range is ideal for your goals.
2) Ascertain why a certain program isnt inducing the intended effect.
3) Possess an unlimited amount of variables to constantly manipulate your program design.
Weve all heard the blind notions that certain parameters are best for strength, hypertrophy (size
gains), and fat loss. While its certainly true that specific parameters are well-suited to an
intended goal, it must be understood that these parameters are often pulled out of thin air. I get
inundated with questions from confused trainees and coaches regarding specific parameters for
maximal strength, hypertrophy, and fat loss programs. But I dont condemn any of them for their
confusion since parameters can vary immensely from expert to expert.
Ive found that a sufficient set/rep volume will determine whether an athlete: increases maximal
strength with hypertrophy, increases hypertrophy without a regard for maximal strength, or
provides a sufficient stimulus to maintain muscle mass during fat loss. Ive outlined three
primary goals that most trainees seek in accordance with the parameters that Ive found most
effective for the intended effect.
1. Maximal Strength with Hypertrophy
The dogma of maximal strength training assumes that heavy-load, low-rep training will cause
minimal, if any, muscle growth. This notion has occurred since those who greatly increase their
loading oftentimes greatly reduce their volume. In other words, they perform low reps with
heavy weights. Why? I blame traditional Western linear periodization schemes that mandate
lower volumes with higher loads.
Anyone who's been around the iron game for an appreciable amount of time knows that linear
periodization has turned out to be a lesson in futility. So lets assume that such reasoning is
insufficient. Therefore, if we simply "think outside the box" and manipulate maximal strength
parameters, we can up the volume.
Why increase volume? Because once you reach a certain set/rep volume threshold, hypertrophy
will occur. If you seek maximal strength and hypertrophy, follow these guidelines:
Table 1
The 24-50 Principle as it Applies to Maximal Strength with
Hypertrophy
Goal Set/Rep
Volume Loading
Rest
Between
Sets
Sessions
per Week
per
Muscle
Group
Maximal
Strength
w/Hypertrophy
24-36 80-90%
of 1RM
70-180
seconds 2-4
Table 1 depicts the parameters Ive found to be necessary and sufficient to induce maximal
strength gains with hypertrophy. Oftentimes, trainees will only perform 3 x 3 or 5 x 3 during
periods of maximal strength training. Obviously such parameters fall short of the minimal
threshold required for hypertrophy.
Arnold was big and strong!
Simply increasing your 3 x 3 to 8 x 3 will provide an immediate hypertrophy effect. A minimal
load of 80% of 1RM is required to recruit high-threshold motor units, while 90% of 1RM
appears to push the upper end of possible loading. Why? Because loads greater than 90% of
1RM often prove to be too taxing when striving for a set/rep volume of at least 24.
Parameters such as 8 x 3, 10 x 3, 12 x 3, 7 x 4, 8 x 4, 9 x 4, etc. all work extremely well to
increase maximal strength and hypertrophy.
2. Hypertrophy Without an Emphasis on Maximal Strength
Sometimes we just want to get big and we dont give a horses ass how strong we are. If that's
you, then this section has you covered!
But remember, merely seeking hypertrophy in a given phase of training can also benefit those
who seek maximal strength. Indeed, increasing hypertrophy can help with maximal strength
efforts since an accumulation of myosin and actin proteins will allow for greater force production
in subsequent cycles.
Hypertrophy targeted training parameters probably vary more than any other intended goal. HIT
trainees merely perform one set to failure that usually consist of 12 reps or so. Therefore, a 1 x
12 volume would equate to a limp-wristed, pansy-assed set/rep volume of 12 thats anything
but sufficient for hypertrophy.
On the other hand, 10 x 10 schemes are often employed in pursuit of greater hypertrophy. This
would equate to a set/rep volume of 100. The problem? Other than the fact that the set/rep
volume is out of my ideal range, the necessary loading wouldn't be ideal for hypertrophy.
In order to successfully perform such a high volume, a load of ~60% of 1RM must be employed.
Ive found such a load to be inefficacious for hypertrophy training due to the fact that smaller
motor units that possess suboptimal growth potential are primarily taxed.
So, if you seek hypertrophy, aim for the following:
Table 2
The 24-50 Principle as it Applies to Hypertrophy
Goal Set/Rep
Volume Loading
Rest
Between
Sets
Sessions
per Week
per
Muscle
Group
Hypertrophy 36-50 70-80%
of 1RM
60-120
seconds 2-4
All of the variables in Table 2 go together like soft breasts and hard asses. If you seek
hypertrophy, the stimulus for growth must be sufficient without overindulgence. A minimum
set/rep volume of 36 is required for hypertrophy, but such volume must be concurrently matched
with proper load selection.
Larry Scott knew a thing or two about hypertrophy.
As you approach a load of 80% of 1RM, Ive found that a volume of 36 is close to ideal for most
trainees. Also, as loads are decreased, volume must be increased to induce hypertrophy. But any
volume greater than 50 won't allow you to utilize a load of at least 70% of 1RM without
inducing excessive structural and neural stress.
Parameters such as 6 x 6, 4 x 12, 5 x 10, etc. provide a powerful hypertrophy effect with the
prescribed loads.
3. Fat Loss
Trainees who seek fat loss must provide a delicate balance of intensity and volume. If the
intensity is too low, muscle mass won't be maintained (or possibly even increased). If the volume
is too high, excessive structural damage will often occur and recovery will take longer than an
obese geriatric running the Boston marathon.
In addition, if you seek fat loss then you must follow an eating plan that forces your body into a
deficit energy state. Such a state is stressful in itself, so weight-training parameters must
adequately address this shortcoming. As such, the following parameters have proven ideal for
those who seek to maintain muscle mass without inducing excessive structural, neural, and
hormonal stress:
Table 3
The 24-50 Principle as it Applies to Fat Loss
Goal Set/Rep
Volume Loading
Rest
Between
Sets
Sessions
per Week
per
Muscle
Group
Fat Loss 24-36 70-80% of
1RM
60-90
seconds 2-3
The parameters in Table 3 are ideal to provide a sufficient stimulus when you seek fat loss.
These guidelines are tightly regulated since its very difficult to maintain a volume greater than
24-36 with 70-80% of 1RM during fat loss phases.
Frank Columbu shredded.
Whenever they try to push the envelope of volume or intensity above these numbers, trainees
quickly become unmotivated (a sign of CNS stress) and overly sore (a sign of excessive
structural stress). As such, both volume and intensity must be tightly maintained while the rest
periods are decreased a little in order to provide a slightly larger cardiovascular stimulus.
Parameters such as 4 x 6, 4 x 8, 5 x 5, 5 x 6, etc. all work well to maintain (or increase) mass
during hypocaloric eating phases.
The Physique You Desire
Study and re-study these parameters when you devise your next training phase. Whether your
goal is strength and size, just size, or fat loss, all of the info is provided for you.
Be sure to constantly rotate your parameters throughout the week. In other words, dont perform
the same parameters for two consecutive workouts. Dont be afraid to get creative, but stick to
the recommended ranges. If you do, youll be well on your way to the physique you desire.
As a bonus, youll be able to spend more time on the beach instead of searching through the
Internet black hole of misinformation!