Should you work out when sore? What research says about DOMS, how long it lasts, when training through it is fine, and when to rest or train other muscles.
Yes, you can usually work out when sore. Mild to moderate soreness is not a reason to skip training: light exercise eases the pain for a while and does not slow recovery. If a muscle is very sore, train a different body part or go lighter for 1 to 2 days, since soreness typically peaks 48 to 72 hours after a session. Sharp pain, swelling, or pain in a joint is different and calls for rest.
You trained hard two days ago, and now walking down stairs hurts. The workout plan says it is leg day again. Do you push through, or wait until the soreness fades?
The answer depends on how sore you are and what you plan to train. Soreness is a normal response to new or harder training, and in most cases it is not a sign that you should stop.
Yes, in most cases you can work out when you are sore. A 2003 review by Cheung, Hume, and Maxwell found exercise to be the most effective way to ease the pain of delayed onset muscle soreness (DOMS), although the relief is temporary. The same review advised reducing intensity and duration for 1 to 2 days after a session that caused intense soreness, or training less affected body parts instead.
So the practical rule is simple: mild soreness, train as planned; heavy soreness in a muscle, train something else or go lighter on that muscle.
| How sore you are | What to do |
|---|---|
| Mild: stiff, fades after warming up | Train as planned |
| Moderate: tender, range of motion a bit limited | Train, but lighten the load or sets for that muscle |
| Severe: painful to move, weaker than usual | Train other muscles or do light cardio for 1 to 2 days |
| Sharp or joint pain, swelling, or dark urine | Stop and get it checked |
Muscle soreness after a workout is mainly caused by small-scale damage to muscle fibers and the inflammation that follows, not by lactic acid. A 2018 review by Hotfiel and colleagues described DOMS as a mild ultrastructural muscle injury triggered by eccentric or unfamiliar exercise.
Eccentric work, the lowering phase of a lift, causes the most soreness. That is why the first squat session in months, a new exercise, or a big jump in volume tends to leave you sore while your usual routine does not.
Muscle soreness usually starts within a day of training, peaks about 48 to 72 hours after the session, and fades within a few days after that. Hotfiel 2018 put peak soreness at 48 to 72 hours post-exercise, which is why the second day after a hard leg session often feels worse than the first.
DOMS also brings temporary drops in strength and range of motion. Cheung 2003 noted reduced joint range of motion and peak torque during DOMS, so expect a sore muscle to perform a little below its best.
Light training while sore does not appear to slow recovery, though it does not speed it up either. In a 2006 study by Zainuddin and colleagues, 14 people did a damaging eccentric arm workout, then one arm performed light exercise on each of the next four days while the other arm rested. The light exercise cut soreness and tenderness by about 40% right after each session, but recovery of strength and other muscle damage markers was the same in both arms.
In other words, a light session can make you feel better for a while, but heavy training on a very sore muscle is unlikely to be your best workout. If soreness keeps carrying into every session for the same muscle, see our guide on how often to train each muscle.
No. Soreness is a poor measure of how much muscle damage you caused, and you can grow without it. A 2002 study by Nosaka, Newton, and Sacco had 110 men do 12, 24, or 60 maximal eccentric arm contractions. The 60-rep group had far more muscle damage than the 12-rep group, yet soreness when the muscle was pressed or flexed was not significantly different between them, and soreness correlated poorly with other damage markers.
A 2011 study by Flann and colleagues went further. One group eased into eccentric cycling over three weeks and avoided soreness and muscle damage; the other started with a damaging session. After 8 weeks of matched training, muscle size gains were equal, and strength rose 25% and 26%. Muscle growth happened without the soreness.
You get less sore over time because of the repeated bout effect: one bout of eccentric exercise protects the muscle from damage in later bouts. A 2003 review by McHugh described this adaptation and linked it to neural, mechanical, and cellular changes, including adding sarcomeres to the muscle.
The protection lasts a long time. In a 2001 study by Nosaka and colleagues, men who repeated an eccentric arm workout 6 months later had less soreness and damage than the first time, but the effect was gone by 12 months. This is why soreness hits hardest when you start lifting or return after a long break, as covered in our first week at the gym guide.
Massage has the strongest evidence for reducing soreness, followed by options like compression garments, cold water immersion, and active recovery. A 2018 meta-analysis by Dupuy and colleagues pooled 99 studies and found these methods produced small to large reductions in DOMS, with massage the most effective for both soreness and perceived fatigue. Stretching did not reduce soreness.
The cheapest fix is prevention. Cheung 2003 recommended introducing new eccentric exercises gradually over 1 to 2 weeks. In practice, that means starting a new program with fewer sets and lighter weights, then building up.
Rest instead of training when the pain is sharp, sits in a joint rather than the muscle belly, comes with swelling, or does not improve after about a week. Those signs point to something other than normal DOMS. Extreme muscle pain with weakness and dark, cola-colored urine after a very hard session needs medical attention the same day.
Also rest or back off when soreness comes with performance dropping across several sessions. That pattern is more about accumulated fatigue than one hard workout, and a planned lighter week can help, as explained in when to deload.
Alexandros is an iPhone app that works like a personal lifting coach you talk to. You log each set in plain English and rate how it felt, from very easy to max effort. If soreness makes a session a grind and a set falls below your rep range, it backs the weight off for next time instead of pushing you to add more. If your lifts stay flat for three sessions in a row, it plans a deload.
It also remembers what matters for your training, like injuries, preferences, and schedule, and lists that memory in Settings where you can edit it. Alexandros is in early access; its terms say certain features require a paid subscription through the App Store.
Usually yes, if the soreness is mild. If the muscle is very sore and weaker than usual, train a different muscle or use lighter weights for 1 to 2 days.
DOMS usually peaks 48 to 72 hours after a workout, according to a 2018 review by Hotfiel and colleagues, and then fades over the following days. Light activity can ease the pain in the meantime.
Not much. A 2018 meta-analysis by Dupuy and colleagues found no reduction in soreness from stretching, while massage was the most effective recovery method.
Yes. In a 2011 study by Flann and colleagues, a group that avoided soreness gained the same muscle size and strength as a group that started with a damaging workout.
Your muscles lost the protection of the repeated bout effect. Nosaka and colleagues (2001) found that this protection lasted at least 6 months but was gone by 12 months.
