Sore After Training? Muscle Soreness Explained
Muscle soreness after a workout is normal, usually harmless and mostly a sign that you did something your body was not used to. The proper name is delayed onset muscle soreness, or DOMS. It tends to arrive 12 to 24 hours after the session, peaks somewhere around day two, and fades within three to five days. It is not a measure of how effective the session was, and you do not need it to make progress. Gentle movement helps more than total rest. Sharp, one-sided or joint pain, or pain that gets worse rather than better, is a different thing and deserves attention.
That is the short answer. The rest of this piece explains why it happens, what to do on the sore days, and how I plan training so new clients are not walking down the stairs sideways on their third day.
Why muscles ache a day or two later
The ache comes from the muscle adapting to unfamiliar work, particularly the lowering phase of a movement, when the muscle is lengthening under load. The bottom of a Romanian deadlift, the descent of a split squat, lowering a dumbbell slowly: these are the moments that leave you stiff on Thursday. The exact mechanism is still debated, but the broad picture is minor disruption in the muscle followed by an inflammatory repair process, which is why the pain is delayed rather than immediate. It is not lactic acid. That clears within an hour or so of finishing.
Three things reliably cause it:
- Novelty. A new exercise, or a familiar one through a bigger range than usual.
- A jump in volume. More sets than you are used to, often after a break or a fresh programme.
- Slow, heavy lowering. Eccentric work produces more soreness than lifting the weight.
The useful part is what happens next. After one bout, the same session produces much less soreness the following week. This is sometimes called the repeated bout effect, and it is the reason a sensible first fortnight matters so much.
Soreness is a poor measure of a good session
Plenty of people judge a workout by how much it hurts two days later. It is an understandable instinct and an unreliable one. You can get very sore from a session that achieved little (a hundred walking lunges on a whim) and barely sore from one that moved you on (a well-planned increase of a couple of kilos on a lift you have trained for months).
Better signs that training is working: the weights or reps you can manage are slowly rising, your technique holds up under load, you recover between sessions and you feel more capable in daily life. If you only feel you have trained when you can hardly sit down, the programme will drift toward novelty and punishment rather than progress. I would much rather a client leaves a little tired and keen to come back on Thursday.
Normal soreness or something else? A quick check
| Usually ordinary DOMS | Worth stopping and getting checked |
|---|---|
| Dull, diffuse ache across the belly of the muscle | Sharp, pinpoint pain, or pain in or around a joint |
| Both sides roughly equal after a two-sided exercise | One side only, especially if you felt something go during the session |
| Worst at 24 to 72 hours, then easing | Immediate pain during the lift, or pain that keeps getting worse after day three |
| Eases as you warm up and move | Swelling, bruising, loss of strength, or you cannot move the joint normally |
One rare but serious condition is worth knowing about. After very extreme exercise, usually a punishing session far beyond what someone is used to, muscle breakdown can be severe enough to affect the kidneys. The warning signs are extreme pain and weakness with dark, cola-coloured urine. That needs urgent medical attention, not a foam roller. It is very unlikely from sensible training, which is one more reason not to chase soreness.
What actually helps on the sore days
No method makes DOMS disappear. Several make it more bearable while it runs its course.
- Move gently. A brisk walk, a few minutes of easy cycling or light versions of the same exercise usually ease the stiffness for a few hours. This is why a walk often feels better than the sofa. Our guide to active recovery days covers what to do on a day off without undoing anything.
- Sleep properly. Most of the repair work happens while you rest. A short night will make the ache feel worse and the next session harder. There is more on this in sleep and muscle growth.
- Eat enough, including protein. Not a cure, but under-eating while training hard tends to make recovery slower.
- Massage or a foam roller, if you like it. It may ease the sensation for a while. It will not speed up the underlying repair dramatically.
- Painkillers. Some people take them. Follow the packet or a pharmacist’s advice, and do not use them to mask pain so you can train through something that is not ordinary soreness.
Static stretching before or after training has not been shown to prevent DOMS in any meaningful way. Stretch if it helps you move better or feel better, not as protection against the ache.
Should you train when you are sore?
Usually, yes, with some adjustment. Mild soreness that eases once you warm up is not a reason to cancel. A useful rule of thumb in the studio:
- Mild (aware of it, moves fine after a warm-up): train as planned.
- Moderate (stiff on stairs, still tight after warming up): train other muscle groups, or do the same muscles lighter, with fewer sets and a shorter range.
- Severe (painful to move normally, reduced strength): take the day for walking and easy mobility, and plan the next session lighter.
The warm-up is also your test. Ten minutes of progressively heavier sets tells you far more than how you felt getting out of bed. If you want a structure for that, see how to warm up before lifting weights.
How I plan the first fortnight to avoid it
The worst soreness I see is almost always self-inflicted: someone returns after a long break and does in one session what they used to do at their peak. The fix is dull and effective.
- Session one is deliberately modest. Two working sets per exercise instead of three or four, and stopping well short of failure.
- Volume rises week to week, not session to session. Add a set or a few reps once the previous dose stops producing much ache.
- New exercises go in one or two at a time, not as a whole new programme on the same day.
- Eccentric-heavy work is introduced gradually, especially Romanian deadlifts, split squats and anything with a slow lowering tempo.
Within two or three weeks of consistent training, most people barely get sore at all from their normal sessions. That is not a sign the work has stopped working. It is a sign you have adapted, which was the point. In private 1-1 personal training in Highgate I track sets, loads and how you report feeling at the start of each session, so the programme adjusts before soreness gets in the way of turning up.
When to check with your GP first
Check with your GP before starting or returning to training if you have a heart condition, high blood pressure, a recent injury or surgery, are pregnant, or are coming back after a long break with health concerns. The NHS physical activity guidelines for adults are a sensible baseline for how much to aim for once you are going. If pain is sharp, localised to a joint or not improving after several days, get it looked at rather than training around it.
Questions we get asked
How long does muscle soreness last after a workout?
Typically it starts within a day, peaks around 24 to 72 hours and is mostly gone in three to five days. Longer than a week, or getting worse, is worth getting checked.
If I am not sore, did the workout work?
Very likely, yes. Lack of soreness usually means your body is used to the work. Judge progress by performance over weeks, not by aches.
Does a cold bath or ice help?
Some people find cold eases the sensation. It does not prevent soreness, and the evidence for it speeding recovery is mixed. Gentle movement and sleep are the more dependable basics.
Why am I more sore on the second day than the first?
That is the normal pattern for DOMS. The repair process builds over the first day or two, so the ache usually peaks on day two rather than the morning after.
If you would like soreness managed for you, the details of coached sessions with Artem are on the training page, and the rest of the building, barbers included, is on the Highgate House homepage.
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