Should I Work Out If I'm Still Sore? When to Go Lighter

Yes, in most cases. Train the muscles that are not sore at your normal weights. When the muscles you train today are still very sore, keep the weight and do fewer sets for 1 to 2 days, and stop if the feeling is sharp or sits in a joint.

Our guide on what to do when a lift hurts covers joint pain during a lift. This post covers the other thing: the ache that shows up a day or two after training and makes the stairs feel steep. It explains where it comes from, why it fades, how your split changes the answer, how much lighter a lighter day should be, and the signs that mean it is no longer soreness.

What is muscle soreness after a workout?

DOMS (delayed onset muscle soreness) is the stiff, tender ache that starts after training and usually peaks 1 to 2 days later. It is not the burn you feel during a set. It arrives after you have gone home.

A review by Cheung, Hume and Maxwell in Sports Medicine (2003) names the usual causes. Eccentric work (the lowering part of a rep) causes most of it. Harder sessions, longer sessions and exercises you are not used to add to it.

Soreness is not lactic acid left in the muscle. The same review lists lactic acid as only 1 of up to 6 proposed theories, and the cause is likely a mix of several. You can drop the lactic acid idea. It does not help you decide anything.

Soreness hits hardest after your first session, a new exercise or a long break. That is why lifters coming back after months off feel it most. If that is you, see how Trackist handles getting back into the gym: pick 'Coming back after a break' as your experience, and the coach starts the first weeks conservatively, as carefully as a beginner's, with proven movements you regain fast.

Does being sore mean the workout worked?

No. Schoenfeld and Contreras (2013) concluded that soreness is not a valid measure of muscle damage or of muscle growth. A session can build muscle and leave you barely sore.

The reason is the repeated bout effect. McHugh (2003) describes how 1 hard session protects the muscle from damage in the next one. So soreness drops as you keep training, even while you keep getting stronger. Less soreness in week 4 than in week 1 is normal. It is not a sign the plan stopped working.

Chasing soreness works against you. Very heavy soreness can cost you reps in the next session, and lost reps are lost progress. Track the log instead. Weight and reps going up over weeks is the signal that counts. Our progressive overload guide explains how to keep those numbers climbing with double progression (stay at one weight until you hit the top of the rep range on every set, then add the smallest step).

Should you work out if you are still sore?

Usually yes. ScienceAlert's summary of the research says training while sore has not been shown to hurt the muscle, but your strength and performance may be lower while the soreness lasts.

Training can even help for a while. Cheung and colleagues found exercise is the most effective way to ease soreness while it lasts, but the relief is temporary. The ache tends to come back once you cool down.

The same review gives the practical rule. After a session that left you very sore, cut intensity and duration for 1 to 2 days, or train less sore body parts instead.

It matters most in 2 cases:

1. The muscles you train today are the sore ones.
2. Today's session needs balance, jumping or landing. Sore, slower muscles make those riskier, as ScienceAlert points out.

In every other case, train as planned.

Which muscles can you train when you are sore?

The answer depends on your split. Our guide on how to choose a workout split covers the options. For soreness, the difference is simple.

On an upper/lower split or push pull legs, today's session usually trains a different part of the body from yesterday. Train it as written, at your normal weights.

On a 3-day full-body plan, every session hits everything, so some soreness is part of the deal. Warm up longer, and let the first working set tell you how you feel.

Here is a worked example on upper/lower. You squat 100 kg for 3 sets of 8 on Tuesday in Lower A. On Thursday your legs are very sore. Thursday is Upper B, so you train it in full. Your legs are not doing the work.

On Friday, Lower B arrives and your legs are still very sore. Say it calls for Romanian deadlifts at 80 kg for 3 sets of 10. Use the lighter-day rule below: 80 kg for 2 sets of 10, each set stopped with 2 or more reps left.

When should soreness mean a lighter day?

Rate the soreness in the muscles you train today from 1 to 5, where 1 is barely there and 5 is hard to move. Then do your warm-up sets and rate it again.

• Low soreness that fades during the warm-up (1 to 2): train as planned.
• Moderate soreness that eases but does not go (3): train as planned, and watch how hard the first working set feels.
• Heavy soreness in today's muscles that stays through the warm-up (4 to 5): keep the weight, do 1 set fewer on each exercise, and stop each set 2 or more reps short of failure.

That last part uses RPE (rate of perceived exertion, how hard a set felt on a scale of 1 to 10). Stopping 2 reps short is about RPE 8. Our post on RPE explained shows how to rate it honestly.

Why cut sets and not weight? The weight stays where your log puts it, so next session still builds on real numbers. The session gets shorter, which is the part that eases fatigue. Dropping the weight on a sore day muddies the log and gives you nothing a shorter session does not.

One rough session is not a signal. A pattern across a week is. If you are very sore every week, the plan has too many sets or added them too fast. Our post on what to do when your workout plan is too hard or too easy covers what to change. If fatigue has built over several weeks, read about the deload week. A deload is a planned, lighter week that lets fatigue drop.

When is it pain and not soreness?

Soreness is a dull ache on both sides, in muscles you trained, and it eases as you warm up. Pain is sharp, sits in a joint, shows up on one side, or gets worse as you add load. Houston Methodist draws the same line between normal soreness and pain that signals an injury.

ScienceAlert lists 2 reasons to see a professional: severe soreness that lasts more than 7 days, and visible bruising on the sore muscle. Medical News Today also lists warning signs worth knowing.

A joint that aches during a lift is a signal to change the lift, not to push through it. Diagnosis and treatment belong to a physio or a doctor. For the next step with a shoulder, knee or back that hurts, read what to do when a lift hurts.

What helps soreness go away faster?

Less than you would hope. Cheung and colleagues found that cryotherapy, stretching, homeopathy, ultrasound and electrical current modalities had no effect on soreness. ScienceAlert notes some evidence that massage or an ice bath helps, but the effect is small.

What is left is plain:

• Easy movement. A walk or light session eases the ache for a while. Medical News Today also points to light activity while you are sore.
• Sleep. Your recovery happens there.
• Food and protein. Eat enough to recover from the work you did.
• Small steps. New exercises and big jumps in sets cause most soreness, so add volume a little at a time.

Putting it together

Remember 3 things:

1. Train what is not sore, at your normal weights.
2. Trim sets, not weight, on muscles that are still very sore.
3. Change the exercise when it is pain, not soreness.

Soreness falls as your body adapts to training. That is the repeated bout effect, not a sign you stopped progressing. Judge progress by the log.

How Trackist handles a sore day

Before the first set of each session, Trackist asks you to rate sleep, soreness and energy, each from 1 to 5. With Apple Health connected, the sleep answer starts from last night's sleep, and you can change it.

After a poor night, low energy or soreness in the half of the body you train today, Trackist offers a lighter session: one set fewer on each strength exercise with more than one, 30 seconds more rest and no finisher, at the same weights. It changes today only, and one tap restores the full session.

No answer ever changes a weight. A bad day trims the session, not the weight, which is the rule this post gives.

When something hurts, you name the exercise, the joint and how bad it is from 1 to 5. The coach swaps in an exercise that spares the joint and usually trains the same muscle, and your profile remembers the kind of movement that hurt. A swap changes the exercise. Trackist does not treat the injury.

Trackist does not adjust the plan after every set. A bad day changes only that day. The plan changes when a reported problem comes back in a later week or when a plan ends. Our post on how an AI personal trainer adjusts your plan explains how that works.

Log your next session in Trackist. Trackist writes a plan around your week and your gym, and suggests your next weight from the sets you logged. Download Trackist on the App Store.