Strength By Fitness

“Am I a non-responder?”. Welcome to another fact-based Strength By Fitness article

 

Over the years, I have encountered quite a few big pillar fears amongst both hardened fitness enthusiasts and sedentary hopefuls alike. One of those is the mythical “I think I am a non-responder”, which is both a shield & a fear based response toward this modern day myth that healthy habits just doesnt work.

This “inclusive” trap does nothing good, because it does not make less healthy fit people feel better, neither does it help anyone actually change their habits. What it does is incorrectly, and for no good reason at all, chain people to less healthy habits by promoting this unhelpful, flawed and harmful mindset that healthy habits just doesnt work for me.

This fear based pillar ties into something else, which is the equally flawed and fabled “plateau” that somehow would suddenly doom a person’s previous fitness progress and flatline that progress for the remainder of their life. To keep this opening paragraph short and sweet, let me cut to the chase.

Plateaus are a healthy and needed part of lifelong progression. Without those regular moments of slower progress, or even a slight dip, no athlete or healthy fit living person would be able to train and progress for very long without breaking something. A plateau is merely your body catching up with the faster strength, speed, and endurance leap you have just taken. There are many aspects to our health, fitness level, performance, and physique that need a lot more time to develop.

And the short answer to the “I think I am a non-responder” fear is that this is extremely unlikely to be the case, and even if you are a terrible responder,  once we dial in your habits correctly, you too will, indeed, progress over time.

Welcome to another fact-based Strength By Fitness article from yours truly.
Coach Mike
Strength By Fitness.

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The fact-based outcome of weekly exercise habits is a guaranteed reality.

No one is a genuine non-responder.

Some progress slightly less than others, yes, but having a slower progression is not the same thing as having no progression or response to better habits.

We all improve our outcomes when we adopt better all-year-round habits across health, fitness, sleep, rest, recovery, nutrition, and lifestyle habits.

No need to take my word and experience for it. Let’s take a look at a study instead.

The study.

82% of the older male participants were deemed excellent responders to a 16 wk resistance training program. 

And only 5% was considered poor responders. Which still isn’t an actual non-responder.

“Given the rarity of true non-responders, our data support heavily loaded resistance training as the  universally recommended first-line strategy for enhancing muscle mass  and strength.”

No one is a

genuine non-responder. Coach Mike, Strength by Fitness

The data.

Fifty-eight healthy elderly men who were all above 64 years of age (age 72 ± 5) were divided into two groups.

The exercise group got 38 participants. 

And 20 ended up in the sedentary group.

One note on that. Sedentary did not mean lying in bed for 16 weeks and watch netflix all day long, 7 days per week. It simply meant no structured exercise. But take your daily walks like normal, bike to work or the store, et cetera.

I am mentioning this because it matters. Even low-effort physical activity is enough to improve health outcomes and maintain some lower form of fitness capacity. Which you will see in some of the sedentary participants.

Cited study.

Soendenbroe C, Andersen JL, Heisterberg MF, Kjaer M, Mackey AL. Heavy resistance exercise training in older men: A responder and inter-individual variability analysis. PLoS One. 2026 Jan 21;21(1):e0338775. doi: 10.1371/journal.pone.0338775. PMID: 41563970; PMCID: PMC12822940.

https://pmc.ncbi.nlm.nih.gov/articles/PMC12822940/

Assessments were conducted at baseline, 8-weeks, and 16-weeks.

And they looked at five different progression outcomes.

Maximal voluntary contraction strength (MVC).

Rate of force development (RFD).

Quadriceps cross-sectional area (qCSA).

And finally, type I and II myofibre cross-sectional area (fCSA).

Outcomes over time meets your habits, every day and week.

Outcomes.

16 weeks of strength training led to a group-level increase in MVC (19 ± 14%), RFD (58 ± 80%), qCSA (3 ± 4%), and type II fCSA (14 ± 25%).

There was no group-level improvement in the sedentary group.

Although some sedentary individuals did enough physical activity to see some mild progression with some metrics.

Yes, biking, taking daily walks, a hike, or running up and down stairs can be enough to prevent your health and fitness metrics from free falling off the cliff.

Substantial inter-individual variability was, of course, observed. And the reason we will always see some individual variance is found both in how different people exhaust themselves on the same fitness plan, as well as differences in nutrition, rest, sleep, and recovery.

Push a harder effort every week and session, without overshooting your capacity for recovery ( and remaining injury free ) and you will gain a bit more than others who hold back a little more. Over the same period of time, be it weeks, months, years and decades.

Assuming you meet the higher price of recovery with good enough nutrition, sleep, and rest.

And that brings us to the other end of that equation. Food habits and sleep, rest, and recovery. 

We know perfectly well that a body that is energy and nutrient-deficient will progress worse than a body that is eating properly. 

And even with healthy food habits, we know beyond a shadow of a doubt that a protein intake of 1.6 g per kg of bodyweight and day generates slightly better outcomes than an intake of 1.2 g when you conduct the same fitness plan.

And when compared to RDA, the difference has been measured to be as much as 2x.

How many non-responders did they find?

After 16 weeks, 82% of the participants who exercised three times per week were classified as Robust or Excellent responders; while only 5% were designated as poor responders.

And when your brain absorb that word “poor responder” keep in mind, that a slower progression, is still not a non-response.

Every poor responder client I have ever met just had to dial in their habits better than the higher rate responder, be more persistent, miss less workouts, take less nutritious shortcuts, make sleep a higher priority and never stop.

When this is the response to being ” poor responder” the outcome is that  one day you might have outgrown that person who had a better progression during that shorter period of time. So you are merely a slower responder, not a non-responder.

And yes, after 30 years of training hard, coaching people and athletes, and competing in sports myself, I have still never encountered an actual non-responder despite having met, trained with and coached many who feared they would be a non-responder.

Related Content

Complete view of Higher-SPC, High-protein foods & fitness outcomes.

All fitness modalities matter, because they build unique benefits.

Habits Vs Genetics.

b

Maintain that nutritionally rich, high-protein, higher-SPC food intake, and fitness habits for life, Health and fitness is a habit, not a 4 week diet and exercise plan.

Cited studies for General context.

1. The 2005 high-protein study.
https://pubmed.ncbi.nlm.nih.gov/16002798/

2. Genetics matter but habits own the driver’s seat.

https://www.sciencedirect.com/science/article/abs/pii/S0167494323002601?s=09

3. Effect of resistance exercise on body composition, muscle strength and cardiometabolic health during weight loss .
https://bmjopensem.bmj.com/content/11/3/e002363?s=09

4. Trends in nutrition and health between 1900 and now.

https://www.sciencedirect.com/science/article/pii/S2213434423000221?via%3Dihub

5. Capturing what counts in muscle failure and sarcopenia. 

https://pubmed.ncbi.nlm.nih.gov/40885204/?s=09

6. Low SPC, UPF and high-protein.
https://www.nature.com/articles/s42255-025-01247-4

7. High-protein myths.
https://www.sciencedirect.com/science/article/abs/pii/S0002916525002540?s=09

8. Non exercise, physical activity and its impact on health and mortality.

https://www.ahajournals.org/doi/10.1161/CIRCULATIONAHA.124.072253?s=09

9. Health outcomes improve for every 3% of additional plant-based protein you consume.
https://ajcn.nutrition.org/article/S0002-9165(23)66282-3/pdf

You can also read this article over at Medium if you are a paying Medium Member.

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