Exercise Mindsets: Uncovering the Truth About No Pain, No Gain Culture
Two clients bring me opposite versions of the same problem. One pushed through a sharp, shooting pain in his knee because "no pain, no gain," and now he's out for six weeks. The other did a solid session, wasn't sore the next morning, and texted me convinced he'd wasted his time. Both got the same myth backwards — and both were really asking the same thing: is DOMS a sign of muscle growth? "No pain, no gain" conflates two completely different sensations — productive effort and an injury warning — and it treats next-day soreness as a scoreboard. So let me clear this up the way I would in the gym: soreness, the kind with the technical name DOMS, is a sign you did something new, not something productive — and the pain you actually need to respect is a different thing entirely. Here's how to tell them apart and what to do about each.
Is muscle soreness (DOMS) a sign of muscle growth?
No. This is the single most useful correction I can give you. DOMS — delayed-onset muscle soreness, the ache that shows up a day or two after a hard or unfamiliar session — tells you your muscles met a stimulus they weren't used to. It does not tell you the session built muscle, and you absolutely can build muscle without it. As Cleveland Clinic states plainly, "a workout can still be productive if you don't feel DOMS." Soreness tracks novelty, not progress — which is why beginners and people trying a new movement get wrecked while well-trained lifters making real gains often feel almost nothing.
One genuinely interesting wrinkle for the science-minded: the textbook story that DOMS is "micro-tears in the muscle" may be incomplete. A 2020 hypothesis paper argues DOMS might actually be irritated nerve endings in the muscle spindle rather than torn muscle fibres. It's a hypothesis, not settled fact — but it's one more reason to stop treating soreness as a damage-equals-growth receipt.
Good pain vs. bad pain: how to tell the difference
This is the distinction the myth erases, and getting it right is what keeps you training for years. Here's the operational version — the cue you feel, and the marker a coach watches for:
| Normal training discomfort (keep going) | Warning pain (stop and assess) |
|---|---|
| Dull, diffuse, spread across the muscle belly | Sharp, shooting, or stabbing |
| Symmetrical (both sides, roughly equal) | Localized to one spot, often a joint |
| Shows up 1–3 days later (that's DOMS) | Hits during the movement, immediately |
| Eases as you warm up and move | Worsens as you continue |
| Fades within a few days | Lingers, or comes with swelling or bruising |
The rule of thumb: a burning, fatiguing ache during a hard set is the muscle working, and next-day soreness is normal. But as the U.S. Army's injury-prevention chief puts it, "acute or immediate pain in a muscle felt during an activity is indication of a strain or tear that needs medical attention." Sharp, joint-located, or asymmetric pain is your body's alarm, not your weakness talking. If you get it, stop the movement — and if it persists, see a clinician before you load it again.
Should you work out with sore muscles?
Soreness isn't an automatic rest day, but it isn't a green light to repeat yesterday either. Use a simple severity gradient:
- Mild soreness, full range of motion: train. Light or active recovery — an easy walk, swim, or bike — actually helps, and you can train other muscle groups normally.
- Moderate to severe soreness: don't re-load that same muscle group. Train something else, or take a genuine rest/active-recovery day. The muscle microdamage from a hard session typically repairs in about 2–3 days, so giving a sore group ~48 hours before you hit it hard again is a sound default.
- Anything sharp or joint-related: that's not soreness, it's the warning pain above. Don't train through it.
And one caution Darius-the-coach will always add: "tough it out" is good advice for the last two reps of a hard set and terrible advice for a pain you can't place. Trying to grind through real pain, in the Army expert's words, "can make things worse."
Should you take ibuprofen for soreness?
Here's a meme worth correcting carefully, because the popular version ("painkillers kill your gains") is an overstatement. The real picture is dose- and age-dependent. High daily doses of NSAIDs — think 1,200 mg of ibuprofen a day for weeks — have been shown to blunt muscle growth in young adults (in one study a low-dose-aspirin group gained roughly twice the muscle of an ibuprofen group). But occasional over-the-counter doses show little effect, older adults sometimes gain more with NSAIDs, and a 2025 study in the Journal of Physiology even found NSAID use augmented muscle growth in trained men.
So the honest, coach-grade answer: don't routinely pop high-dose ibuprofen to mask normal training soreness, especially if you're young and chasing muscle. Save NSAIDs for an actual injury or genuine need, take normal soreness as a sign to manage your recovery, and don't lose sleep over the occasional pill.
What actually drives gains — and how to recover
If soreness isn't the driver, what is? Progressive overload: gradually asking your muscles to do a little more over time — more weight, more reps, better control — within a range you can recover from. That last part is where the gains actually get built, because muscle adapts during recovery, not during the set. A concrete recovery baseline beats "prioritize rest" as advice:
- Sleep is the highest-leverage recovery tool there is — protect 7–9 hours.
- Give a hard-trained muscle group ~48 hours before loading it heavily again.
- Use active recovery — easy movement on off days clears soreness faster than lying still.
- Eat enough protein spread across the day to give your muscles their building blocks.
The honest bottom line
Here's the reframe to replace the old proverb: pain is information, not currency — and soreness is a sign you did something new, not proof you did something right. Build progress through consistent, progressively harder training you can recover from; respect sharp or joint pain as the warning it is and get it looked at; and stop using next-day soreness as your scoreboard. Nothing in training works in a week, and grinding through real pain is the fastest way to lose the months you've put in. Train hard, train smart, and let the gains come from the work plus the recovery — not from how wrecked you feel the next morning.
Frequently Asked Questions
The phrase took off as a 1980s fitness-culture motivational mantra urging people to push past their limits. As exercise science matured, that 'pain equals progress' framing was re-examined — and it conflates productive effort with injury warnings.
No. Delayed-onset muscle soreness (DOMS) means your muscles met a new or harder stimulus, but it isn't required for or proof of growth. You can build muscle with little or no soreness — soreness tracks novelty, not progress.
Dull, symmetrical soreness that appears 1–3 days later and eases as you warm up is normal. Sharp, immediate, joint-located, asymmetric, or worsening pain is a warning sign — stop the movement and assess, and see a clinician if it persists.
Mild soreness with full range of motion — light or active recovery is fine, and you can train other muscle groups. Moderate-to-severe soreness — rest that group or train something else, giving it about 48 hours. Never train through sharp or joint pain.
It usually starts 1–3 days after a hard or unfamiliar workout and rarely lasts more than five days; the underlying muscle microdamage typically repairs in about 2–3 days.
Not routinely. High daily doses of NSAIDs can blunt training adaptations in young adults, though occasional over-the-counter doses and older adults differ. Reserve them for a genuine injury rather than masking normal soreness.
Muscle adapts during recovery, not during the set. Protect 7–9 hours of sleep, give a hard-trained muscle group about 48 hours before loading it heavily again, use active recovery on off days, and eat enough protein across the day.
