Muscle Soreness (DOMS): Is Being Sore a Sign of a Good Workout?
That deep ache a day or two after training feels like proof it worked. But the science says soreness is a poor measure of progress. Here's what it really means.
You wake up two days after leg day and can barely sit down on a chair — and part of you is proud, because surely that soreness means the workout worked. It is one of the most common beliefs in the gym, and it is mostly wrong. Soreness tells you something happened; it does not tell you that you built muscle.
What DOMS Actually Is
Delayed-onset muscle soreness (DOMS) is the ache that shows up 24–72 hours after a session, especially after new exercises or heavy lowering (eccentric) work. It is tied to microscopic muscle damage and the repair and inflammation that follow. One thing it is not: a build-up of lactic acid. That myth has been disproven for decades — lactate is cleared within an hour of training.
Why Soreness Does Not Equal Growth
- Soreness mostly reflects novelty — a new movement, more eccentric loading, or more volume than your body is used to.
- As you adapt, the same workout stops making you sore even though you keep growing. Scientists call this the 'repeated bout effect'.
- Muscles that rarely get very sore still grow perfectly well with consistent training.
- You can build muscle with almost no soreness, and be crippled by a session that drove very little growth.
When Soreness Is Actually a Problem
Heavy, lingering soreness that stops you training well is a warning, not a badge. It means you did too much too soon, and it eats into the next session and your weekly training volume — and volume, not soreness, is what actually drives growth. Sharp pain, joint pain or soreness that keeps getting worse is a different signal and deserves caution or rest.
Better Ways to Track Progress
- Are your loads and reps trending up over the weeks? That is progressive overload — the real driver of growth.
- Are you hitting enough hard sets per muscle each week, in the productive range?
- Is your recovery good enough to show up and perform in your next session?