DOMS

DOMS, short for delayed onset muscle soreness, is the dull ache and stiffness that shows up in muscles roughly a day after a workout that was harder or more unfamiliar than usual, and it commonly peaks somewhere between 24 and 72 hours afterward before easing off on its own over the following days. It is different from the sharp, immediate pain of an injury, which tends to appear during or right after activity rather than a day later.

New exercises, a big jump in weight or intensity, and movements that lengthen a muscle under load, such as running downhill or lowering a heavy weight slowly, are especially likely to trigger a noticeable bout of DOMS. It is a normal response to unaccustomed effort rather than a sign that something has gone wrong, though the resulting stiffness can genuinely limit how well you move for a day or two.

Light movement, gentle stretching, a warm shower, and tools like a foam roller or massage gun are commonly used to take the edge off the stiffness while the muscle recovers on its own timeline. What does not help much is trying to train through it at full intensity, which risks poor form and a higher chance of a real injury. Pain that is sharp, one-sided, or lasts well beyond a week is different from typical soreness and is worth having checked by a doctor.