DOMS Explained: Why You're Sore After Training and What Helps
What causes DOMS, how long it lasts, whether to train sore, and what actually helps — from protein and sleep to light movement.
Quick answer
DOMS (delayed onset muscle soreness) is the stiffness and tenderness that starts 12–24 hours after training and peaks around 24–72 hours. It's most common after new exercises, lowering (eccentric) movements or a jump in volume. What helps most: light movement, enough protein, sleep and time. It fades as your body adapts — the "repeated bout effect".
You try a new leg program, feel fine walking out of the gym — and two days later, stairs are your enemy. That's DOMS. It's uncomfortable but normal, and understanding it helps you train smarter.
What causes DOMS?
DOMS follows unfamiliar or more demanding exercise, especially eccentric work — the lowering phase of a squat, Romanian deadlift or downhill running. This type of loading causes minor disruption in muscle fibres and surrounding tissue, followed by a repair and inflammation response that makes the area more sensitive. It is not caused by lactic acid, which clears within an hour or so of training.
Typical DOMS timeline
| Time after training | What you'll feel |
|---|---|
| 0–12 hours | Usually little or nothing |
| 12–24 hours | Stiffness begins |
| 24–72 hours | Peak soreness and tenderness |
| 3–5 days | Gradually fades |
The repeated bout effect
Here's the good news: after a session causes DOMS, doing a similar session again — even a week or two later — causes much less soreness. Your muscles, connective tissue and nervous system adapt. That's why the first week of a new program hurts most, and why easing into new exercises is smart.
Is soreness a sign of a good workout?
No. Soreness reflects novelty more than effectiveness. Experienced lifters can train very productively with little soreness. Chasing DOMS can lead to excessive volume and poor recovery. Judge sessions by performance over time — see our guide to progressive overload.
What actually helps DOMS
Light movement
Easy activity — walking, cycling, swimming or a light session for the sore muscles — increases blood flow and often temporarily eases soreness. Read our guide to active recovery days.
Protein and total food
Muscle repair needs building blocks. Aim for 1.6–2.2 g of protein per kilogram of bodyweight across the day. A protein shake after training is a convenient way to start, though the exact timing matters less than your daily total — see the anabolic window myth.
Sleep
Much of your repair happens during sleep. Aim for seven to nine hours. Our sleep and recovery guide explains why.
Massage and foam rolling
Both may reduce the perception of soreness for a while, and many people find them helpful.
Heat and cold
A warm bath or shower can feel good. Cold water immersion may reduce soreness for some people, though some research suggests regular ice baths straight after strength training may blunt muscle-building adaptations, so time them carefully if size is your goal.
What doesn't help much
- Static stretching: reviews have found that stretching before or after exercise makes little difference to DOMS.
- Complete rest: lying still often makes stiffness feel worse.
- Extra supplements in huge doses: more isn't better.
Supplements and recovery
No supplement eliminates DOMS, but some support the recovery process. Protein (including casein before bed) supports muscle repair. EAAs can be useful during long sessions — see EAAs intra-workout. Magnesium is involved in normal muscle function; read our magnesium guide. Omega-3s are popular for general health in people who eat little oily fish.
Our Recovery & Joint Support Stack brings casein, EAAs, collagen, omega-3, magnesium and a night-time formula together in one order for less than buying them separately.
Should you train through DOMS?
Usually, yes — with some common sense. Light to moderate training of a sore muscle tends to make it feel better once you're warmed up. If soreness is limiting your range of motion or technique, train a different muscle group or do easy cardio instead. Expect strength to be slightly down for a day or two after a very hard session; that's normal.
A practical approach for a new program: train every muscle group as planned, but reduce sets in the first week and add them back over the following two to three weeks as your body adapts.
How to prevent extreme soreness
- Introduce new exercises with fewer sets for the first week.
- Increase volume gradually — by a set or two per muscle per week.
- Warm up properly.
- Program a lighter week every 6–10 weeks; see deload weeks.
When soreness isn't DOMS
Sharp pain, pain during a specific movement, swelling, bruising, or pain in a joint rather than muscle may indicate an injury. Very severe soreness with weakness, significant swelling or dark-coloured urine after extreme exercise needs prompt medical attention.
General information only. If you're unsure whether pain is normal soreness or an injury, see a physiotherapist or your GP. Supplements should not replace a balanced diet.