Key Takeaways
Why Muscle Soreness Myths Persist
Few fitness experiences are as universal — or as misunderstood — as the deep ache that sets in a day or two after a hard workout. Delayed-onset muscle soreness, commonly called DOMS, has accumulated a thick layer of folklore over decades of gym culture. Some of that folklore is harmless. Some of it leads people to train less effectively, or to feel discouraged when their body stops responding the way they expected.
Exercise science has significantly advanced our understanding of what causes DOMS, what it signals, and what actually helps. The gap between what research shows and what most people believe is surprisingly wide. Below, we address the most common misconceptions head-on.
For a broader look at how different training methods affect your body, see our breakdown of strength training vs. cardio.
Myth
Lactic acid buildup is what causes that soreness you feel the next day.
Fact
Lactic acid (more precisely, lactate) clears from muscle tissue within an hour or two of exercise — long before DOMS begins.
The lactic acid theory of muscle soreness dates back over a century and has been thoroughly revised by modern exercise physiology. Lactate is actually a fuel source the body uses during intense effort, not a damaging waste product that lingers. DOMS typically peaks 24–72 hours after exercise — a timeline completely inconsistent with lactate accumulation. Current research points to microscopic damage to muscle fibers and the subsequent inflammatory repair response as the primary drivers of that delayed ache.
Myth
If you're not sore after a workout, you didn't work hard enough.
Fact
Soreness reflects novelty and mechanical stress, not necessarily training quality or the stimulus for muscle growth.
Soreness is most pronounced when you perform movements your muscles aren't adapted to — especially exercises with a significant eccentric (lengthening) component, like the lowering phase of a squat. As you repeat those movements consistently, soreness diminishes even as strength and endurance continue to improve. Experienced athletes often feel minimal soreness from workouts that are genuinely challenging and effective. Using soreness as a proxy for progress can drive people toward constantly changing their routines in counterproductive ways.
Myth
Stretching before exercise prevents muscle soreness.
Fact
Pre-exercise static stretching has not been shown to prevent DOMS in controlled research studies.
Multiple well-designed studies have found that stretching — whether before or after exercise — has little to no measurable effect on the onset or severity of DOMS. A dynamic warm-up that gradually raises heart rate and prepares joints for movement does serve real purposes (improving range of motion, potentially reducing acute injury risk), but preventing next-day soreness is not among them. Conflating the two leads some people to feel falsely protected or to blame themselves when soreness arrives despite their stretching routine.
Myth
You should push through soreness with another hard workout to 'loosen it up.'
Fact
Training intensely on severely sore muscles may increase the risk of further tissue damage and prolong recovery.
Light movement can genuinely help — gentle activity increases circulation and may ease the sensation of soreness without creating additional stress on damaged tissue. But returning to high-intensity or high-volume training before muscles have adequately recovered is a different matter. Doing so repeatedly is associated with overtraining, plateaus in performance, and elevated injury risk. Distinguishing between the dull, diffuse ache of normal DOMS and sharp, localized, or worsening pain is important: the latter should prompt a pause and, if persistent, evaluation by a healthcare professional.
Myth
Soreness means your muscles are growing.
Fact
Muscle protein synthesis and hypertrophy can occur without significant soreness, and soreness alone does not confirm muscle growth is happening.
The relationship between soreness and hypertrophy (muscle size increase) is indirect at best. Research shows that trained individuals can make consistent strength and size gains with minimal soreness once their bodies have adapted to a training stimulus. Conversely, a movement pattern that causes significant soreness — particularly an unfamiliar one — doesn't automatically translate to superior muscle-building results. Progressive overload, sufficient protein intake, and consistent training are better-supported drivers of muscle development than chasing soreness as a goal.
What You Can Actually Do About Soreness
Understanding what causes DOMS points toward what genuinely helps — and what doesn't. Active recovery (light movement such as walking or easy cycling) may modestly reduce perceived soreness by increasing blood flow. Some research supports cold water immersion as a short-term relief strategy, though its effects on long-term adaptation are debated among sports scientists.
Adequate sleep and protein intake support the muscle repair process, though neither eliminates soreness entirely. Over-the-counter pain relievers like ibuprofen may blunt soreness sensation, but some research suggests they could interfere with muscle adaptation if used consistently — a conversation worth having with a healthcare provider if soreness is significantly affecting your routine.
When Soreness Isn't Normal
Typical DOMS feels like a dull, diffuse muscle ache that improves within a few days. Seek prompt medical attention if you experience sharp or stabbing pain, significant swelling, severe weakness, or unusually dark urine following intense exercise — the latter can be a sign of rhabdomyolysis, a serious condition requiring immediate care. Do not attempt to self-diagnose or push through these symptoms.
Perhaps most importantly: soreness tends to diminish as your body adapts to a given exercise. That's a feature, not a flaw. If you're struggling to stay consistent in the early weeks, knowing that soreness naturally decreases with regular training can be a genuine motivator. For those working with limited equipment, home workouts carry their own honest trade-offs worth understanding before you start.
This article is for general informational and educational purposes only and does not constitute medical advice. If you experience sharp, severe, or persistent pain during or after exercise, consult a qualified healthcare professional.