(Menno Henselmans. (2012, Jan 27). 7 Principles of Exercise Selection [Web log post]. Retrieved Feb 18, 2015, from http://www.t-nation.com/training/principles-of-exercise-selection)
To paraphrase a wise man, “Small, weak, and injured is no way to go through life.” But if you design your workouts around the wrong exercises, that’s exactly how you’ll end up; dreadfully unmuscular, embarrassingly weak, and prone to chronic injuries.
Proper exercise selection can be tough. There are countless lifts to choose from and most of them have several similar-but-different variations. Fortunately, there’s a set of objective criteria to qualitatively rate exercises, which allows you to make the most effective choice between any group of exercises with the same purpose – like figuring out why an overhead extension is a better choice for triceps than a pressdown.
Admittedly, this is only a partial list of criteria, but they do apply to the vast majority of exercises. Let’s take a look at exactly what these principles cover and learn how to apply them to several basic exercises.
1. The Limit Factor
An exercise is most effective for a bodypart if that bodypart is a limiting factor in the execution of the exercise, overlooking the other criteria.
If your grip always gives out first on deadlifts, then your posterior chain will remain understimulated and deadlifts end up being a poor choice for training your lower body. Similarly, your lower chest and the long head of your triceps are active movers during a pull-up, but they’ll never limit your performance in the lift, so pull-ups are not seen as an effective exercise for these bodyparts.
This criterion removes almost all unstable exercises from the bodybuilder’s exercise menu. Standing on an unstable surface will make your balance or, at best, the muscles in your feet the limiting factor in the exercise.
This principle also applies to using unstable objects as weights. Single-arm barbell overhead presses suck for shoulder training because your forearms and the stabilizers in the rotator cuff will give out long before your delts get the chance to do enough work.
For any selection of bodyparts, a compound exercise is superior to more isolated exercises, provided the compound exercise fulfills the other criteria for said bodyparts.
This isn’t so revolutionary. If you can train three muscles at once, why train them separately? Compound exercises put much higher neurological, hormonal, and cardiorespiratory demands on your body than simple isolation exercises.
Compound exercises are more than a sum of their isolation exercise parts, which is why the guy with the bigger bench press will be more impressive than the guy focusing on flys and skull crushers.
Compound exercises also allow your body to spread the external force over multiple joints, which is beneficial for joint health and strength. Basically, they’re a more natural way to move your body and they lend themselves to meeting the other exercise criteria better than isolation exercises alone.
That is not to say isolation exercises are useless. They absolutely have their place, but they can never rival compound exercises and should never be prioritized over them when it comes to getting big or strong. You can certainly include curls in your program, but only if the program already contains compound pulling exercises.
However, note the second part of this principle’s original definition: For any selection of bodyparts, a compound exercise is superior to more isolated exercises, provided the compound exercise fulfills the other criteria for said bodyparts.
That means chin-ups are superior to the combo of barbell curls and straight-arm pulldowns, because chin-ups train the lats and biceps in a manner that meets all other criteria (which we’ll learn in a moment). In terms of training economy, chin-ups thoroughly dominate barbell curls and straight-arm pulldowns.
However, when it comes to triceps work, the bench press is not superior to overhead extensions because the standard bench press doesn’t work the triceps through the full range of motion and it leaves the long head understimulated. As such, overhead extensions and bench presses can’t be directly compared using the compoundedness criterion. They’re just different, like comparing a hammer and a screwdriver. Both are good tools, but they can’t do each other’s job very well.
3. Range of Motion
The more an exercise moves joints through their full range of motion, the better it is, overlooking the other criteria.
It has been empirically demonstrated, time and time again, that lifting with a full range of motion (ROM) is superior to partial ROM for building strength. Using full ROM increases your mobility for that movement pattern and does so more effectively than basic stretching.
Increasing the ROM also increases the compoundedness of the exercise. Partial squats are only somewhat effective for training the quads and maybe the spinal erectors, but full squats effectively involve the entire posterior chain. Lastly, training with a full ROM is easier on your nervous system and your joints because lighter loads can be used.
Wait, what? Using less weight creates a better exercise? Yes. If absolute, maximal weight was all that mattered, everybody would be doing isometric-only or eccentric-only exercises and they’d be outgrowing clothes faster than a Kardashian marriage. But that’s clearly not the case.
We all know that, ideally, the bar should touch the chest when we bench press and shallow quarter squats are only done by frat kids in between sets of curls, but few people realize that the ROM principle is actually applicable for all exercises.
For almost every pulling or pushing movement, whatever implement you’re gripping (bar, dumbbell, cable handle) should touch your body at some point during the exercise. That includes pull-ups, rows, and overhead presses.
The ROM principle also dictates that the optimal grip for most exercises is near-shoulder width. The way most human bodies are built, right around shoulder width offers the greatest ROM for pushing and pulling movement patterns, unless your hands actually become an interference to the ROM, like during the military press, in which case your hands have to move slightly outward.
In short, cutting down the ROM on an exercise demands a damn good reason. And for the record, “a shorter ROM lets me go heavier, and that gives me an ego-boner,” is a damn silly reason.
4. Tissue Stress Distribution
The more an exercise’s stress is applied to its targeted structures, and the less stress is applied to peripheral tissue, the better the exercise, overlooking the other criteria.
Targeted exercises should stimulate your muscles maximally and target other tissues, like tendons, only insofar as their adaptations are required for maximum muscle growth. Factors like bone density, tendon strength, and cardiovascular health tend to take care of themselves if you do high-intensity compound exercises, so you don’t need to worry about actively strengthening anything other than your muscles.
See my previous Muscle Specific Hypertrophy articles for more information on how to maximally stimulate individual muscles.
Applying this criterion further is generally done on an individual exercise basis, but some generalizations can be made. The following are essentially sub-criteria of this principle:
• Your body isn’t structurally adapted to pushing against things that are behind your body; it’s unnatural and causes unnecessary shoulder stress. As a result, exercises such as dips, behind-the-neck presses, and behind-the-body side or front raises should be excluded due to this criterion.
• The “core” is structured to stabilize the spine, not move it. Spinal movement, especially flexion, is unnecessary for bodybuilders. Never round your back, keep it flat or arched. Anatomical position is almost always the optimal position for force transfer, maximal core muscle activation, and minimal peripheral tissue stress, such as spinal shearing forces.
• The more an exercise forces your body into a specific movement pattern, the worse the exercise, overlooking the other criteria. So… dumbbells are more favorable than barbells which are more favorable than machines. Free weights generally have very acceptable tissue stress distribution, while machines almost never do.
• Closed kinetic chain exercises are superior to open kinetic chain exercises, overlooking the other criteria. When you apply force to an object, either you move or that object will move.
If you move, the exercise’s kinetic chain is closed. If the object moves, the exercise’s kinetic chain is open. The classic example is to think of a push-up compared to a flat dumbbell press. In the first, you’re moving (closed chain), and in the latter, the object is moving (open chain).
Closed chain exercises allow your body’s structure to determine which joints move and how much, which takes stress off of the joints and lets the muscles do the work instead.
This finding has been replicated many times and is hugely underrated. Closed chain exercises are better for your joints and your muscles. This is why squats are superior to leg presses and pull-ups are superior to pulldowns. It’s also why rows and bench or overhead pressing exercises aren’t perfect.
5. Dynamic Contraction
Exercises that consist of an eccentric and a concentric portion are superior to exercises that are purely isometric, concentric, or eccentric, overlooking the other criteria.
Long-term studies that measure increases in cross-sectional area (muscle mass) consistently support this concept. Contrary to popular belief, the hierarchy of muscle building is eccentric-concentric contractions, followed by isometric contractions, followed by concentric contractions, followed lastly by eccentric contractions. As usual with the fitness industry, empirical data falsifies most theories.
This hierarchy reinforces the same theme that’s been repeated in several principles so far. “Natural” movements, in the sense of a movement being dictated by the structure of your body, are best.
You’re strongest on the concentric when it’s immediately preceded by the eccentric phase of a movement. That’s how you naturally jump, kick in doors, and throw heavy objects at people doing curls in the squat rack. Oh, and it’s the most effective way to do most exercises, too.
6. Strength Curve = Resistance Curve
The closer the resistance curve of an exercise approximates a healthy trainee’s strength curve, the better the exercise, overlooking the other criteria.
If an exercise’s strength and resistance curves don’t match, some muscles involved in the lift will remain understimulated. You know how you usually fail exercises at the same point? Ideally, that point shouldn’t exist and muscle failure should only occur at points where your underdeveloped bodyparts can no longer apply enough force.
That way, the exercise would allow you to develop all the muscles used in the lift in a perfectly, structurally-balanced manner. Note the explicit mention of a healthy trainee in the principle.
If you routinely fail to lock out your deadlifts, there’s no problem with the deadlift itself. It’s a problem within your structural balance. You, most likely, have disproportionately weak glutes, which are creating the sticking point at a given position in the movement.
Exercises that satisfy this criterion would automatically balance you out, because, in the case of the deadlift, your glutes would receive a greater training effect than the other muscles used.
The resistance curve for many exercises is flat, meaning, there’s a constant resistance. The weights don’t change mass and gravitational acceleration is constant, unless you’re training on a space station in orbit. Exercises that require the weight to move vertically (directly opposed to gravity’s line of pull) have a constant resistance curve.
Exercises in which the weight moves in a “circular” fashion (think leg extensions and barbell curls) normally have resistance curves that have maxima where the moving bodyparts are horizontal and minima where the moving bodyparts are vertical.
For example, the biceps are under minimal resistance at the bottom of a dumbbell curl and they’re handling maximal resistance at 90-degrees flexion (the midpoint). That may seem easy enough, but to determine the exact resistance curve for other movements, you may need a solid understanding of physics.
How do you determine your strength curve? Well, other than paying attention and simply feeling where you’re strongest and where you fail during an exercise, it helps to think of a muscle’s length-tension relationship.
A decent rule of thumb is that muscles are strongest in their natural anatomical position (think military posture) or when in a moderately stretched position.
For pushing exercises, the resistance is generally greatest at the beginning of, or halfway through, the concentric part of the movement. This is why, in the case of the overhead press, bench press, or squat, you’re more likely to fail at the bottom of the rep or before reaching the halfway point.
For pulling exercises, the resistance is generally greatest at the end portion of the concentric. This is why, for example, so many people find it nearly impossible to actually touch their chest to the bar when doing pull-ups. Note: This is giving you a cop-out for such an inability. If you can’t touch your chest, you’re weak or fat. Either build some mid and lower trap strength or cut some fat, pudgy.
So how do we match our strength curve to the exercise’s resistance curve? Many people take the easy way out and simply avoid the hard parts of exercises. The trouble with this “solution” is that it violates the ROM principle and it certifies them as nitwits who probably text their own mother, “Hpy bday 2 u” instead of mailing her a birthday card, because it’s easier.
An actual, useful solution would be to use accommodating resistance like chains or bands. Several longitudinal studies have found that adding chains or bands to the bench press increases strength and muscle gains.
While it’s also true that some studies have found no differences, that’s most likely because it can be difficult to determine the optimal amount of chain or band to use. Apply too much added resistance and you negate all the benefits. Apply too little, and you can still squeak out some benefit, but it’ll be sub-optimal. Just like Goldilocks, the right amount will be somewhere in the middle, making the resistance curve equal to the strength curve.
Almost every exercise can benefit from using chains or bands to make the exercise’s resistance accommodate to the optimal strength curve. Of course, you’d sometimes have to get crazily creative to implement this knowledge, and it’d be a constant process of estimation and fine-tuning to calculate the right amount of band or chain resistance.
If chains or bands aren’t an option for your gym, you can rely on the stretch reflex to train in accordance to this principle. When a muscle lengthens, the strength of subsequent contractions are increased. Popular theory holds that this strengthening is due to elastic energy from the stretched muscle, as occurs when you stretch an elastic band – the farther you stretch it, the harder it pulls.
Though that theory is partially correct, comparing the stretching of muscles to that of elastic bands is extremely simplistic and the stretch reflex is, in fact, primarily a neural process. Muscle lengthening increases signaling for motor neuron activity, but it’s still your muscles doing the work.
If it really were a process of elasticity, it would occur even without an active subsequent contraction. You can easily test this. Dive-bomb down during a squat and see how far you “effortlessly” bounce back up. (Okay, on second thought… just imagine dive-bombing down on a squat. Your patellar tendons will thank you.)
Activating the stretch reflex is still a good technique that can be used to accommodate an exercise’s resistance curve, especially for pushing exercises. It can also be used for some pulling exercises where strategic momentum can help you to overcome weak points in the movement.
Face pulls, for example, have a strength curve that decreases as you move along the concentric portion, making the exercise uselessly-easy at the start and increasingly more difficult as the bar approaches your face.
Therefore, they benefit greatly from using momentum. Don’t just pull on the handle. Heave it and make sure it practically brushes your eyebrows at the end. However, you need to be structurally balanced and injury-free before using any type of strategic momentum. If you aren’t, you’ll just exacerbate your imbalances by allowing the underdeveloped muscles to avoid training stress.
The more precisely an exercise’s resistance can be determined, the better the exercise, overlooking the other criteria.
The best mass-building exercises lend themselves both to high absolute loads and small incremental loads. Ideally, we want to choose exercises that allow us to increase the max weights used, but we need the ability to take baby steps towards those maxes.
Absolute, or maximum, load is generally a limiting factor in bodyweight exercises. Handstand push-ups, for example, are superior to overhead presses with respect to their kinetic chain (closed vs. open), but they’re far worse than overhead presses with respect to their absolute loading. Once you’ve reached beast-mode and you’re doing handstand push-ups for reps, you’ll add resistance how? Yeah, exactly.
Incremental loading is actually a limiting factor for many exercises. Machines have fixed weight increments in their stacks and most gyms only have dumbbells that increase five pounds at a time. Even barbell exercises can only be loaded with the smallest plates in the gym multiplied by two, because lopsided bars are a bad idea, no matter how “small” the extra is on one side.
While beginners and intermediates may be able to progress with such rigid increases, the ideal incremental load should be measured in a percentage of the working weight, not necessarily a strict 5 or 10 pounds.
While five pounds may a good incremental increase for barbell rows, it can be inefficient and excessive for shoulder isolation work. This is why small magnetic add-ons, like PlateMates, can be so beneficial. If you have them, be sure to use them. If you don’t have them, put them at the top of your list of “Lifting Toys I Gotta Buy.”
Practical Application of the 7 Principles
Now that you’ve made it through the lesson, it’s time to see the rules at work. Let’s apply the exercise selection criteria to a few basic movements.
1. We’re hitting triceps today. Should we do two-arm kickbacks, rope pushdowns, or standing overhead extensions with a rope?
Well, they all have the triceps as the limiting factor, they’re all dynamic contractions, and have no significantly different tissue stress distributions, although ropes are generally easier on the joints.
The microloadability depends on your gym’s equipment, specifically the dumbbells and weight stacks, but kickbacks require such small weights that incremental loading is almost always a problem, unless you’ve already ordered those PlateMates.
Overhead extensions are the most compound, because the overhead position puts you in full shoulder flexion and allows the long head of the triceps to participate fully, which is not the case in the other two exercises.
All three exercises have the potential to use full ROM, but overhead extensions lend themselves best to using it because the resistance curve better approximates the human strength curve. Kickbacks and pushdowns have very little resistance at the stretched position.
Overhead extensions also have an increasing resistance curve along the eccentric, which allows you to use the stretch reflex.
Therefore… drum roll please… overhead extensions are the best exercise of the three.
2. Everybody says that deadlifts are magical must-have mass-builders, but how does the deadlift really score against the criteria?
I know I’m going to upset a lot of people with this, but deadlifts are not a good tool for mass. They don’t involve dynamic contractions, which is a huge downside. Deadlifts also put the legs through a limited range of motion which is arbitrarily determined by the radius of the standard 45-pound plate.
These issues can be partially resolved by not resetting between reps, using a very wide grip, or using an extended range of motion (from a deficit or with smaller plates), but even then, the exercise doesn’t satisfy the limit factor principle. With those changes, the grip or erector spinae are most likely to give out first.
Still, deadlifts aren’t even ideal for these muscle groups because they’re both slow-twitch dominant and require relatively-high volume for optimal growth, but working deadlifts with such a high volume will leave your nervous system fried and extra crispy, like everyone’s favorite breakfast side dish.
However, this isn’t to say that all deadlift variations are bad for bodybuilders. Romanian deadlifts, for example, remain a good exercise.
By now, you’ve hopefully absorbed enough to start making more deliberate and intelligent exercise choices. As with the optimizing of all training parameters, exercise selection should be a systematic process based on objective criteria.
It’s tempting to do the convenient and comfortable exercises, or the ones that make you feel like a badass, but those feelings are short-lived. We know that the “fun stuff” isn’t always the useful stuff, and vice versa. The physique you build from smart training should be the walking billboard to your dedication to the iron.
I always have to remind people, “Do you want to look good for the one hour you’re inside the gym or for the 23 hours you’re outside of it?” So put the time into designing the best program, do the hard work, and earn the results.
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