"No Pain, No Gain" Is a Terrible Training Metric
Soreness does not tell you whether training worked. The evidence has been clear for years: DOMS is a weak proxy for hypertrophy and an unreliable programming metric.
Glossary
- DOMS (Delayed Onset Muscle Soreness)
- The soreness that typically shows up 24 to 72 hours after training. It is not the same thing as muscle damage or muscle growth.
- Hypertrophy
- An increase in muscle fiber size as an adaptive response to resistance training.
- Mechanical tension
- The force applied to muscle during training. It is the main driver of muscle growth.
- Creatine kinase (CK)
- An enzyme that rises in the blood when muscle fibers are damaged. It is used as an indirect marker of damage.
- Repeated bout effect
- The phenomenon where repeated exposure to the same training stimulus progressively reduces DOMS and related damage.
- Fascia
- Connective tissue that surrounds and links muscles. It may be a major source of the discomfort perceived as DOMS.
- Nociceptors
- Nerve receptors that detect potentially harmful stimuli and send pain signals to the nervous system.
- Training volume
- The total number of effective sets performed per muscle group across the week.
You trained legs yesterday and now you can barely walk down the stairs. Your first thought: great workout.
But that post-workout soreness — the ache that appears 24 to 72 hours later — does not mean what you think it means. If you still use it as a progress thermometer, you are measuring with the wrong tool.
What DOMS actually is
DOMS stands for Delayed Onset Muscle Soreness. It appears 24 to 72 hours after training, especially when there is a strong eccentric component or the stimulus is new.
For decades it was blamed on direct muscle fiber damage, but more recent research suggests connective tissue may explain much of the pain. Wilke and Behringer (2021) argue that deep fascia has a high density of nociceptors and may account for soreness better than direct muscle irritation.
In other words: what feels like “muscle soreness” may not be coming mainly from the muscle.
The correlation that does not exist
If DOMS were a good growth indicator, you would expect a proportional relationship: more soreness, more hypertrophy. That is not what the data show.
Nosaka, Newton, and Sacco (2002) compared multiple markers of muscle damage after eccentric exercise and found that soreness on palpation did not significantly correlate with any real marker of damage. The strongest associations barely reached r = 0.32.
And if DOMS does not even reflect damage well, it certainly cannot be trusted as a predictor of growth.
DOMS vs Hypertrophy: They Do Not Move Together
Normalized comparison across common training scenarios: soreness can be high with little growth and low while muscle still adapts.
Based on: Editorial synthesis from Flann et al. (2011), Schoenfeld & Contreras (2013), and Wilke & Behringer (2021)
Growth without pain: the direct evidence
Flann and colleagues (2011) compared one group that jumped straight into intense eccentric training with another that spent three weeks adapting gradually before starting the same program. The naive group had severe DOMS and creatine kinase levels five times higher. The pre-trained group did not.
After eight weeks, both groups gained the same amount of muscle and strength. Hypertrophy occurred regardless of soreness, and anabolic markers increased similarly in both groups.
Schoenfeld and Contreras (2013) summarized the takeaway clearly: DOMS may indicate that some tissue damage occurred, but it cannot be used as a definitive measure of muscular adaptation.
- Running a marathon can produce severe DOMS with virtually zero hypertrophy.
- Quads and hamstrings often create far more soreness than delts, yet all of them grow with adequate stimulus.
- Beginners experience the most DOMS precisely when they are least adapted, not when they are best at training.
The repeated bout effect
There is a phenomenon that finishes dismantling the myth: the repeated bout effect. When you repeat a similar stimulus, DOMS drops sharply. If pain were necessary for growth, progress should stop as soon as you adapt to an exercise.
But that is not what happens. A well-designed program keeps producing adaptation with less and less soreness because the neuromuscular system and connective tissue become more efficient.
Repeated Bout Effect: Less Soreness, Ongoing Adaptation
Normalized week-by-week timeline showing soreness falling after repeated exposure while productive stimulus remains.
Based on: Editorial synthesis from Flann et al. (2011) and Wilke & Behringer (2021)
What coaches should track instead of soreness
If DOMS is not useful as an indicator, what is? The signals that matter are the ones that actually change with adaptation and let you adjust the program with intent.
When a coach centralizes programming, load tracking, and routine updates in one system, they can spot plateaus, performance dips, or deload needs before the client reduces everything to a simple “yes, I was sore”.
- Load and volume progression: if a client is moving more weight or accumulating more effective sets over time, progressive tension is happening.
- Training consistency: three sessions per week for six months predicts more than one brutal week followed by two mediocre ones.
- Centralized progress data: seeing performance, adherence, and adjustments in context is better than chasing soreness.
DOMS as a warning sign, not a progress sign
There is one case where DOMS does matter: when it is excessive. High soreness can reduce force output, alter motor patterns, and make the next session worse.
If your client shows up wrecked every week, that does not prove training quality. It usually shows that volume, novelty, or recovery are being managed poorly.
Using soreness as a quality metric is like judging a book by the sound it makes when it hits the floor.
What actually matters
Post-workout soreness is neither a reward nor a guarantee. It is a biological response to novel stress that usually fades with adaptation.
Measure what actually drives progress: load, volume, consistency, and execution quality. That is where the evidence of effective training lives.
References
- Delayed-onset muscle soreness does not reflect the magnitude of eccentric exercise-induced muscle damage — Nosaka, Newton & Sacco (2002)
- Muscle damage and muscle remodeling: no pain, no gain? — Flann et al. (2011)
- Is Postexercise Muscle Soreness a Valid Indicator of Muscular Adaptations? — Schoenfeld & Contreras (2013)
- Is "Delayed Onset Muscle Soreness" a False Friend? — Wilke & Behringer (2021)
- The Science of Sore — DOMS Explained — Stronger by Science
Ready to stop guessing and start tracking what matters? Book a demo and see how to centralize your client progress.