FormaGet FormaSoreness is a sensation, not a measure of muscle growth.
Soreness can show that a session was new or demanding to a muscle, but it does not confirm that the muscle grew. You do not need to be sore to build muscle.
Published and last reviewed November 5, 2026 · 7-minute read
Published by Forma · Editorial responsibility: Aymane Belarbi, founder
How to read soreness in your training
| What you feel | What it tells you | What it cannot prove |
|---|---|---|
| Soreness after a new exercise | The movement or range was unfamiliar to the muscle | That the session built more muscle than a familiar one |
| Soreness fading as you repeat an exercise | The repeated-bout effect is reducing the response | That the exercise stopped working or that growth has stopped |
| No soreness after a familiar session | The session matched what the muscle already handles | That the session was wasted or that no growth occurred |
| A strong pump | Short-term fullness in the working muscle | Muscle fiber tension, damage, or long-term growth |
| Sharp or lasting pain | Something may need attention beyond normal training soreness | That the muscle is growing, or that training through it is safe |
What the cited research does and does not show
A 2023 review of the mechanisms of mechanical overload-induced hypertrophy treats mechanical tension as central to the growth stimulus. It describes the contribution of muscle damage as debated rather than established as a requirement for growth. A 2023 study examined muscle-damage responses after biceps curls performed to failure. Damage responses are a separate question from how much a muscle grows.
A 2025 study of the Nordic hamstring exercise found that repeating the same exercise produced a smaller damage and soreness response than the first exposure, which is the repeated-bout effect. A 2017 study found that training to failure can delay some recovery outcomes. No study reviewed here shows that how sore you feel predicts how much muscle you will gain.
What soreness actually tracks
Novelty of the exercise
Soreness is most often reported after a movement, range, or variation that the muscle has not repeated recently. A new exercise or a long layoff can produce it even when the set count is ordinary.
The repeated-bout effect
In a 2025 study of the Nordic hamstring exercise, repeating the same exercise produced a smaller damage and soreness response than the first exposure. Fading soreness often reflects familiarity with the movement, not lost growth.
Eccentric and lengthened work
Soreness can be more pronounced when a session includes a large amount of lengthened or eccentric work, such as slow lowering under load. That describes how the work was performed, not how much the muscle grew.
No workout log or app can measure damage or growth from how a session felt
A workout log, including Forma, can record exercise, load, reps, optional RIR, and weekly volume. None of these, and no app, can measure muscle damage or muscle growth from how a session felt. Forma displays what you logged. It does not turn soreness or a pump into a growth reading.
What to use instead of soreness
Log the exercise, load, and reps
Record each set so you can see whether load or reps moved over several weeks. A complete record of the work is something you can compare across sessions.
Track progression over weeks
Look for more reps at the same load, or more load at the same reps, across several weeks. Progression across time is a more useful basis for decisions than one session's sensation.
Check weekly volume and effort
Review weekly sets per muscle and optional RIR so the total work is visible. Effort context shows how hard a session was without treating soreness as proof of anything.
Judge the next session on the plan and the log
Choose the next session from your program and your logged results. If pain is sharp or lasting, have it assessed by a qualified professional rather than training through it.
Are you judging the session by how sore you are?
Forma keeps exercise, load, reps, optional RIR, and weekly muscle volume in one view, so you can judge progress from the record rather than from soreness. The log does not measure growth, but it shows what you actually did. Free to download. Forma Pro is optional.
Not ready for an app? Read Progressive overload vs training to failure or How to count training volume.
Frequently asked questions
Does soreness mean muscle growth?
No. Soreness is a sensation that can follow a new or demanding session, but it is not a measure of how much muscle you built. No study reviewed here shows that how sore you feel predicts how much muscle you will gain.
Do you need to be sore to build muscle?
No. A 2023 review treats mechanical tension as central to the growth stimulus, while the role of muscle damage is still debated rather than established as a requirement. A session without soreness is not a wasted session.
Is it bad if I am never sore?
Not by itself. Lack of soreness can simply mean the exercise is familiar to the muscle, which is common after repeated training. Judge your progress by logged load, reps, and weekly volume over several weeks rather than by the day after.
Does a strong pump show muscle growth?
No. A pump is short-term fullness in the working muscle, and it does not show how much muscle you gained or how much tension the fibers experienced.
Primary references
A 2023 review of current understanding and areas of disagreement.
International Journal of Exercise Science, 2023. PMID: 37124449.
International Journal of Sports Medicine, 2025. PMID: 40280182.
European Journal of Applied Physiology, 2017. PMID: 28965198.
Keep reading on recovery and growth
Track the work, not the ache.
Forma records what you lifted, how many reps you completed, and how much weekly volume you did, so you can review progress without relying on soreness. Download Forma to start a log of every set. Record load and reps for every set with the weight lifting tracker.
Read the mechanical tension guideDownload Forma