What is DOMS? A quick guide

DOMS stands for delayed-onset muscle soreness — the tender, stiff feeling that tends to peak a day or two after a session rather than during it. It is the reason a tough leg day can make the stairs feel like a personal insult on Wednesday.

It usually shows up after something new, harder than usual, or with a lot of lengthening (eccentric) movement — think the downward phase of a squat or running downhill. Your muscles are adapting to a demand they were not quite ready for.

When you challenge a muscle beyond what it is used to, you create tiny disruptions in the muscle fibres. Your body responds, repairs and rebuilds a little sturdier — that response is part of why you get stronger over time.

The soreness is a normal part of that process, not a sign you have done damage. It tends to be worse the first time you try something and eases as your body gets used to the movement, which is why a routine that crept up on you in week one feels fine by week four.

Gentle movement usually beats total rest. A walk, an easy cycle or some light mobility work keeps the area moving and often takes the edge off the stiffness more than lying still does.

Warmth, a cooling gel, a warm bath, decent sleep and staying hydrated can all make the days more comfortable while your body does its thing. None of these are a cure — DOMS settles on its own — but they make it easier to live with.

DOMS is dull, generalised and symmetrical — both legs after squats, both arms after pull-ups — and it eases over a few days. That is the normal kind.

Sharp, sudden, one-sided pain, swelling, or an ache that is getting worse rather than better is a different signal. If something does not feel like ordinary soreness, do not train through it — rest it, and get it looked at by a physio or GP if it persists.