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Weider´s training principles: The isolation principle

Several muscles can be trained as a unit or isolated and trained individually. All muscles are involved more or less in every movement – either as stabilizers, agonist, antagonists or synergistic. If a particular muscle is to be built up, it needs to be exercised as separately as possible from the other muscles.

The isolation principle

The main focus for isolation work is to concentrate fully on using the main muscle to move the weight.
Main Muscles Worked: The muscles that are used the most during the exercise.
Secondary Muscles Worked: Muscles that assist the main muscles in the exercise.
Stabilizers: Muscles that are not worked by movement, but rather assist in stabilizing the body in addition to the weight of the exercise.
Let´s analyze the Barbell Curls, for example:
Main Muscles Worked:
  1. Biceps Brachii
Secondary Muscles Worked:
  1. Brachialis
  2. Brachioradialis
  1. Deltoid, Anterior
  2. Trapezius, Upper
  3. Trapezius, Middle
  4. Levator Scapulae
  5. Wrist Flexors
Some people often make the mistake that isolation work is useless and a full compound routine is all one needs to build muscle. While compounds are the quickest way to work your body, they fail to fully exhaust the muscles. This is where isolation work is needed.
While a compound workout is faster, isolations will better target each individual muscle, resulting in a complete workout. This puts more stress on the muscles, and thus makes them grow better than a full compound workout.

What Are Some Of The Benefits Of An All Isolation Workout?

Results: Put in simpler terms, it will give you maximum muscle growth. When body parts are neglected they won’t be able to grow. Isolation movements give you the ultimate edge. You get to hit the muscle group that couldn’t be hit with compound movements, or it wasn’t hit as good and that’s why it’s lacking.

Completely exhausting a muscle. Compounds work multiple muscles at once, yet it is impossible to work each of those muscles to its max with a single compound exercise. One muscle will tire out before the other. Thus the only way to get a complete workout with compounds would be to do a compound exercise for every muscle in your body. And that is not feasible due to energy and time. This is where isolation work shines, each muscle can be worked to its maximum potential that does not take an extreme amount of time or more energy than one has.

Fewer opportunities for injuries: Injuries can arise in all types of workouts, but they are much less common in isolation exercises. This being because compounds are more intense than isolations. They use several muscles at once, which greatly opens the door for one muscle overpowering another, thus resulting in a pulled muscle. Examples are the “Big 3”: squats, deadlifts, and bench press. Squats and deadlifts put a great deal of pressure on your spinal column while bench press puts pressure on your chest and shoulders at once, often contributing to a pulled muscle if the barbell slips.
Fitness woman doing exercises on white background

Who Would Benefit From Using An All Isolation Workout?

The people who gain the most benefit from an all isolation workout would definitely be people looking for a symmetrical body.
Others who would benefit from an all isolation workout would be older people who may not have the strength or bone support to do squats, deadlifts, bench presses or pull-ups.
Also for beginners, who may not know correct form for the big compound exercises or have enough strength to perform them, would benefit from an all isolation routine.
There are not many people that can do pull-ups on their first day in the gym or can do a set of squats in proper form. An isolation workout would give these people an introduction to weightlifting before they start doing the more advanced exercises. Whatever the reason, an all isolation routine has its place.
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Weider´s training principles: The progressive overload principle

Training Plan

Table of Contents

Who´s Joe Weider?

Joe Weider (November 29, 1919 – March 23, 2013) was a Canadian bodybuilder and entrepreneur who co-founded the International Federation of BodyBuilders (IFBB) alongside his brother Ben. He was also the creator of Mr. Olympia, Ms. Olympia, and the Masters Olympia bodybuilding contests.
Joe Weider
Joe’s most indelible addition to the science and sport of bodybuilding is the Weider Principles. Over 30 theories and techniques that forever changed the means by which someone could build a strong, muscular body:
  1. Progressive Overload
  2. The Set System
  3. Isolation
  4. The muscle confusion principle
  5. Muscle Priority
  6. Pyramid Training
  7. Split-System
  8. Circulation
  9. Supersets
  10. Compound Sets
  11. Holistic Training
  12. Cycle Training
  13. Iso-Tension
  14. Cheating
  15. Tri-Sets
  16. Giant Sets
  17. Pre-Exhaustion
  18. The Rest-Pause Principle
  19. Peak Contraction
  20. Continuous Tension
  21. Retro-Gravity
  22. Intensive Reps
  23. Double-Split
  24. Triple-Split
  25. Partial Reps
  26. Burns Training
  27. Quality
  28. Descending Sets
  29. Instinctive
  30. Staggered Sets
  31. Superspeed
I think you will agree with me that trying to explain them all in a single post would be crazy, so we’ll start with the first one.

The progressive overload principle

Progressive overload is the idea that to increase any aspect of physical fitness (muscle mass, strength, stamina, etc.), your muscles need to be continually put under increased stress, you have to force your muscles to perform more work than they previously have. Simple, right?
Most beginners apply, knowingly or not, this principle. They start training by lifting little weight, progressively increasing it up to a point. Let’s say the typical skinny guy starts out lifting 40 pounds on the bench press. Week after week he adds 5-10 pounds until he lifts 80 pounds.
Sounds familiar? Can you relate to this example? Have you seen someone doing it? That´s the progressive overload principle, the core of all physical training, and forms a solid basis for successful training.
At a certain point, things get messy. This guy can´t lift more than 80 pounds. I reached my peak, he thinks. And start looking for other ways to progress like advanced training programs, revolutionary diet plans, magic pills… It´s ok, no judgment. We all have the right to explore whatever paths catch our attention.
The mistake here is to think that progress is exponential when it really is linear. The boy in our example soon manages to double the amount of weight he lifts (from 40 to 80 pounds) and hopes to double the weight he lifts again. But he gets frustrated because from 80 pounds onwards the progress is not as spectacular as at the beginning.
The green line represents exponential growth, the red line represents linear growth:
We usually expect spectacular, dramatic progress like the green line, but the truth is that physical progress works like the red line. With that said, be careful about over-complicating things.
So, how do we put this principle at work?

Applying the principle

We must change to the least one of the variables involved in the workout:

  1. Lifting more weight,
  2. performing more sets/reps, 
  3. increasing training frequency, and/or
  4. decrease your rest periods between sets.

Lifting more weight

Most pro bodybuilders speak wonders and encourage you to lift heavy, and so do I, but in due time. The word “heavy” means “difficult to lift or move” and this is a different weight to each person. Whatever is difficult to lift today for you, it will be easier to lift next month.

How do we lift heavier safely and effectively?

According to the Progressive Overload Principle, no matter what range of reps you work with, you should try to add some weight to the equation every week.

E.g. You perform 4 exercises on Mondays targeting a specific muscle group. The first day goes like this:

  1. Exercise #1: 50 pounds
  2. Exercise #2: 50 pounds
  3. Exercise #3: 50 pounds
  4. Exercise #4: 50 pounds

Next Monday you try:

  1. Exercise #1: 55 pounds
  2. Exercise #2: 50 pounds
  3. Exercise #3: 55 pounds
  4. Exercise #4: 50 pounds

The third Monday:

  1. Exercise #1: 55 pounds
  2. Exercise #2: 55 pounds
  3. Exercise #3: 55 pounds
  4. Exercise #4: 55 pounds

The fourth Monday:

  1. Exercise #1: 60 pounds
  2. Exercise #2: 55 pounds
  3. Exercise #3: 60 pounds
  4. Exercise #4: 55 pounds

As you see, you´re progressively adding more weight to each session, assuring continuous progress. Do not try to make big jumps, because you risk an injury. 

Performing more sets/reps

In the early years of bodybuilding, most experts believed that to increase muscle mass, we should only complete one set of each exercise.
Weider saw it differently. He was the first to recommend working out using several sets of one exercise (3-5 sets per exercise) to exhaust each muscle group and to stimulate maximum muscle growth.
My advice: start with three sets of each exercise and continue increasing the number of sets until you make five. This strategy will also help you increase your muscle strength gradually without obsessing with the weight you lift. 
You perform 3 sets, 12 reps with 50 pounds. That´s 50x12x3 = 1800
You perform 5 sets, 12 reps with 50 pounds. That´s 50x12x5 = 3000
Pretty nice progress, isn´t it? In a single exercise.
You can also go for more reps. If a set calls for 8 reps doesn’t mean you should stop at 8 if you are capable of doing more. In fact, with the same weight, it is normal that you can do more repetitions after a few workouts. On the other hand, If you can do more reps than prescribed, it may be time to increase the weight on that exercise.

Increasing training frequency

Manipulating frequency while regulating volume is another way of progress.

If you were to train, for example, your legs once per week, that´s 52 times per year. If you were to train your legs twice per week you would have 104 times per year. Don´t forget that it´s not only to double the frequency but to adjust the volume. How do we do that?

FrequencyMondayTuesdayWednesdayThursdayFridayTotal Sets
1 x per weekLeg (16 sets)    16
2 x per weekLeg (8 sets)  Leg (8 sets) 16

The total volume is the same at the end of the week but the number of stimuli per week is different. 

Several factors must be considered: available days per week, time available each day, personal stress levels, etc.

Decrease your rest periods between sets

This is the most tricky variable to play with. Rest time between sets. The best amount of rest between sets depends on what specific goal you’re training for. So, if you change your rest time drastically, you could totally miss your goal.

  1. To get stronger, the rest period is 3 to 5 minutes between sets.
  2. To get bigger, the rest period is 1 to 2 minutes between sets.
  3. To increase muscular endurance, the rest period is 45 seconds to 2 minutes between sets.

With these ranges in mind, you can vary rest periods between sets, as long as you keep your resting in the right range for your goal. Meaning, if your goal is to get stronger, you shouldn´t rest for less than 3 minutes. If your goal is to get bigger, don´t go for less than 2 minutes.


The Progressive Overload Principle is a basic, easy, yet effective way to constantly progress to a greater physique. It allows you to experiment with different training variables such as weight, set, reps, and rest time, and see which ones work best for you.

You will need some time (we are talking about several months) to be able to test everything that this principle has to offer you. For no means I say this to discourage you, on the contrary, I´m trying to tell you that this principle opens you to a universe of opportunities ahead.

It’s up to you to challenge yourself in each training session and go one step further, one repetition further, one set further … Well, you get the idea.

If you think that I have left something behind, or you want a further explanation, let me know in the comments.

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