Body Atlas

Healthy Muscle Habits · Muscles

Why am I sore two days after exercise?

Delayed soreness is repair — and it is not lactic acid.

The simple answer

The soreness that peaks a day or two after unfamiliar exercise has a name — delayed onset muscle soreness — and a persistent myth attached. It is not lactic acid: that clears within about an hour of stopping.

Go deeper

There's more: delayed soreness is repair — and it is not lactic acid. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.

Explore this concept in Body Atlas →

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