Force Transmission vs Muscle Activation: Why “Feeling It” Is a Poor Proxy for Effective Training

One of the most persistent ideas in strength training is that the quality of a session can be judged by how much you “feel” a muscle working.

The logic is simple: if you can feel a muscle, it must be doing the work.

At a physiological level, however, sensation and function are not the same thing.

Muscle activation reflects local neural drive and contractile activity. But movement – and therefore meaningful loading – is determined by how effectively force is produced, transmitted, and expressed across a system of joints and tissues.

Mechanical tension remains the primary driver of adaptation. But for that tension to be meaningful, it must be effectively distributed through the system rather than isolated locally.

It is entirely possible to generate a strong local sensation in a muscle while contributing relatively little to useful force production or movement quality.

In other words, what you feel is not necessarily what is doing the work.

“The neuromuscular system does not control muscles in isolation but in functional synergies that simplify the control of movement.”
— Nicolai Bernstein

The distinction that actually matters: production vs transmission

At a mechanical level, training outcomes are not determined by whether a muscle is active, but by how effectively force moves through the system.

This can be simplified into three stages:

• Force production: the ability of contractile tissue to generate force
• Force transmission: the ability to transfer that force across joints and connective structures
• Force expression: the resulting movement

Most training conversations focus almost entirely on the first.

This is where concepts like muscle activation, “mind-muscle connection”, and local fatigue dominate. These are not irrelevant, but they are incomplete.

Because in multi-joint human movement, force production is rarely the limiting factor.

The limiting factor is far more often the system’s ability to organise and transmit that force.

If force cannot be transmitted effectively, it does not matter how much is produced, it will not be expressed in a meaningful way.

Mechanical tension, as a driver of adaptation, depends on this system working coherently. It is not just about generating tension locally, but about how that tension is distributed across tissues under load.

When transmission breaks down, the body does not stop producing force. It redirects it.

And that is where compensation begins.

“Movement emerges from the interaction of multiple systems, constrained by both the task and the organism.”
— Karl Newell

Force leaks: where training actually breaks down

If force is not transmitted efficiently, it is not simply lost, it is redistributed.

This is what we can describe as a ‘force leak.’

A force leak occurs when energy generated by contractile tissue is dissipated or redirected due to insufficient stability, poor joint organisation, or inadequate coordination between segments.

The system still produces force. It just fails to channel it effectively.

In practical terms, this often presents as:

• Loss of trunk stiffness during lower body loading
• Poor scapular positioning reducing upper limb output
• Instability at the foot and ankle disrupting proximal force transfer
• Excessive joint movement where rigidity or control is required

In each case, the limitation is not the muscle’s ability to contract. It is the system’s ability to maintain a pathway for force to travel.

This distinction matters.

Because when force leaks are present, increasing effort does not solve the problem, it amplifies it.

More load, more intent, or more fatigue will simply drive force into the path of least resistance.

Over time, this leads to:

• inefficient movement patterns
• disproportionate loading of certain tissues
• reduced tolerance to load
• increased injury risk

From the outside, the session may look productive. Internally, the system is becoming less efficient.

And importantly, none of this is reliably detected through sensation.

A muscle can feel highly active while the system it belongs to is functioning poorly.

“Proximal stability is required for distal mobility and force expression.”
— Vladimir Janda

Why “feeling it” becomes a misleading metric

Sensation is often treated as confirmation.

If a muscle “burns”, fatigues, or becomes highly perceptible during an exercise, it is assumed to be working effectively.

But sensation is not a direct measure of force production or force transmission. It is a subjective output influenced by multiple factors, including:

• local metabolite accumulation
• ischemia (restricted blood flow)
• novelty of a stimulus
• attentional focus
• fatigue

These factors can increase the perception of effort without improving the mechanical quality of the movement.

In many cases, they do the opposite.

When training is guided primarily by sensation, individuals often begin to alter movement strategies to increase that sensation. This may involve:

• reducing contribution from stabilising structures
• exaggerating joint motion
• slowing movement excessively
• or biasing load into a specific tissue at the expense of overall coordination

The result is a shift away from efficient force transmission and towards locally dominant strategies.

This is where the problem emerges.

Because a stronger “feeling” is interpreted as progress, even when the system is becoming less organised.

Over time, this creates a disconnect between perception and performance:

• exercises feel harder, but produce less useful output
• local fatigue increases, but global capacity does not
• tissues are stressed, but not necessarily strengthened in a meaningful way

Mechanical tension still drives adaptation. But if that tension is not being expressed across the system effectively, its value is limited.

Sensation can accompany effective training.

It just cannot be used as evidence of it.

“Perception of effort is not a direct reflection of the mechanical work performed.”
— Samuele Marcora

The coordination problem: how the body actually organises movement

Human movement is not controlled at the level of individual muscles.

It is organised as a coordination problem.

The nervous system does not select single muscles in isolation. It organises groups of muscles into patterns that achieve a task while balancing competing demands:

• efficiency
• stability
• adaptability
• perceived safety

These patterns are shaped by constraints – the structure of the body, the demands of the task, and the environment in which it is performed.

From this perspective, movement is not something that is executed exactly the same way each time. It is something that is continually adjusted to meet the demands placed upon it.

This has important implications for training.

When you attempt to artificially increase the contribution of a single muscle – by focusing on “feeling it” – you are imposing a constraint that the system would not naturally prioritise.

In some cases, this is useful.

But in many cases, it disrupts the system’s ability to organise itself efficiently.

The result is often:

• reduced coordination between segments
• increased energy cost for the same task
• decreased stability under load
• less adaptable movement under fatigue or speed

In other words, the system becomes more fragile.

This is why movements that are highly “felt” in the gym do not always transfer well to performance, or even to consistent execution across sessions.

They are solutions to an artificially constrained problem, not robust strategies for real-world movement.

Effective training does not attempt to override coordination.

It works with it.

“Coordination is the process of mastering redundant degrees of freedom of the moving organism.”
— Nicolai Bernstein

What to prioritise instead: objective markers of effective training

If sensation is an unreliable guide, then the question becomes:

What should you use instead?

A more useful approach is to assess whether force is being produced, transmitted, and expressed effectively under load.

This shifts the focus from how an exercise feels to what it actually does.

In practice, this can be evaluated through three key markers:

1. Output

Is the load moving as intended?

This does not simply mean completing the repetition. It means producing force in a way that results in controlled, consistent movement.

Breakdowns in output often present as:

• inconsistent bar path
• loss of control at key points in the range
• inability to maintain intent across repetitions

These are not just technical errors. They are indicators that force is not being expressed efficiently.

2. Control

Is joint position maintained under load?

Effective force transmission requires the system to maintain organisation as load increases.

Loss of control may appear as:

• excessive movement at joints that should be stable
• inability to maintain alignment under fatigue
• compensatory strategies emerging as load increases

Control is not about rigidity everywhere. It is about stability where required, and movement where intended.

3. Transfer

Does the pattern hold under different conditions?

A movement that only works under ideal circumstances is not robust.

Effective training should produce patterns that:

• remain consistent under fatigue
• tolerate increases in load
• adapt to changes in speed or complexity

If a pattern breaks down as soon as conditions change, it suggests that force transmission is fragile.

Taken together, these markers provide a more objective framework for evaluating training quality.

They do not rely on perception. They rely on performance.

Sensation can still be present, and often is, but it becomes secondary.

The question is no longer whether you can feel a muscle.

It is whether the system can organise and use it effectively.

“Practice should be evaluated not only by immediate performance, but by its effect on retention and transfer.”
— Richard Schmidt

This is the basis of how I structure training in practice with clients. Further detail on how this is applied can be found here

Final Thoughts

If you rely on how something feels to judge whether it is working, you are using the least reliable feedback available.

Sensation is easy to create. It is not difficult to make a muscle burn, fatigue, or feel highly active.

What is far more difficult — and far more valuable — is to organise the system so that force is produced, transmitted, and expressed efficiently under load.

That is what determines whether training actually transfers.

Mechanical tension still drives adaptation. But tension that cannot be distributed and expressed effectively is of limited use.

This is the distinction.

The goal is not to feel more.

It is to function better.

Frequently Asked Questions

Isn’t feeling a muscle important for hypertrophy?
Mechanical tension is the primary driver of hypertrophy. Feeling a muscle can accompany this, but it is not a reliable indicator that sufficient or appropriate tension is being applied. In some cases, an increased sensation reflects local fatigue or restricted blood flow rather than meaningful loading.

What is the difference between muscle activation and force transmission?
Muscle activation refers to the neural drive to a muscle and its local contractile activity. Force transmission refers to how that force is transferred through joints and connective tissues to produce movement. Effective training requires both, but activation alone does not guarantee effective transmission.

What are “force leaks” in training?
Force leaks occur when energy generated by muscles is lost or redirected due to poor stability, coordination, or joint organisation. This reduces the efficiency of movement and can increase stress on certain tissues, even if the exercise feels difficult.

Should I stop focusing on mind-muscle connection?
Not entirely. It can be useful in specific contexts, such as rehabilitation or when trying to improve awareness of a poorly functioning muscle. However, it should not be the primary method for evaluating training quality.

How do I know if an exercise is working if I don’t rely on feeling it?
Focus on objective markers: consistent and controlled movement, stable joint positions under load, and the ability to maintain performance under fatigue or increased demand. These reflect whether force is being used effectively.

If you’re looking to apply this approach within your own training, you can enquire via the contact form

References

Bernstein, N. (1967). The Co-ordination and Regulation of Movements. Pergamon Press.

Enoka, R. M. (2008). Neuromechanics of Human Movement (4th ed.). Human Kinetics.

Farina, D., Merletti, R., & Enoka, R. M. (2014). The extraction of neural strategies from the surface EMG. Journal of Applied Physiology, 117(11), 1215–1230.

Newell, K. M. (1986). Constraints on the development of coordination. In Motor Development in Children: Aspects of Coordination and Control.

Janda, V. (1983). Muscle Function Testing. Butterworths.

Marcora, S. M. (2009). Perception of effort during exercise is independent of afferent feedback from skeletal muscles, heart, and lungs. Journal of Applied Physiology, 106(6), 2060–2062.

Schmidt, R. A., & Lee, T. D. (2011). Motor Control and Learning: A Behavioral Emphasis (5th ed.). Human Kinetics.