You finish a workout feeling good.
Then the next morning arrives.
Getting out of bed feels suspiciously difficult. Sitting down requires considerably more planning than it did yesterday. And stairs have somehow become your greatest enemy.
Perhaps the strange part is that you don't remember exercise affecting you this much before.
So what changed?
Age is an obvious suspect, particularly if you're returning to exercise in your 30s, 40s or 50s. But blaming everything on getting older misses most of the story.
How hard you trained, what movements you performed, whether those movements were familiar, how consistently you've been exercising, your sleep and your overall recovery can all influence how you feel afterwards.
And there's another important distinction.
Muscle soreness isn't automatically evidence of a good workout.
Sometimes it's simply evidence that you've done something your body wasn't accustomed to.
What Is That Post-Workout Soreness?
The classic soreness that develops after exercise is known as delayed onset muscle soreness, usually shortened to DOMS.
Unlike pain from an acute injury that may happen during exercise, DOMS develops later.
NHS musculoskeletal guidance describes it as commonly appearing around 24 to 72 hours after activity, particularly following unfamiliar activity or a sudden increase in exercise duration, frequency or intensity.
You might notice:
Muscles feeling tender when touched
Stiffness
Discomfort when moving
Temporary reductions in strength
A feeling that muscles are unusually tight or heavy
DOMS is particularly associated with exercise containing substantial eccentric muscle contractions.
That's when a muscle produces force while lengthening.
Think about lowering a dumbbell under control, descending stairs, walking downhill or lowering yourself during a squat.
It's one reason a new strength workout can feel perfectly manageable while you're doing it and then introduce itself properly the following day.
Why Can the Same Workout Suddenly Make You More Sore?
One of the biggest factors isn't your age.
It's novelty.
Your body adapts remarkably well to activities it performs regularly.
Do the same type of training consistently and you'll often experience less soreness from it over time.
Change the movements, dramatically increase the load, add hills to your walking route, start running again or return to the gym after six months away and the response can be completely different.
This is why an experienced cyclist can get surprisingly sore after a relatively short strength workout.
They're fit.
They're simply not adapted to that particular stimulus.
Fitness is specific.
Being good at one form of exercise doesn't automatically prepare every muscle for every other form.
The Weekend Comeback Problem
This is particularly common when someone used to exercise regularly.
Your brain remembers what you could do.
Your muscles may not currently be prepared for it.
You remember running 5K comfortably.
You remember lifting that weight.
You remember doing an hour-long class.
So after several months or years away, you start somewhere close to where you stopped.
The workout may even feel surprisingly good.
Then the soreness arrives.
The mistake wasn't that you've suddenly become old.
The training dose was simply too large relative to what your body is currently accustomed to.
Returning gradually isn't admitting defeat.
It's giving your body time to rebuild its tolerance.
Does Getting Older Really Affect Exercise Recovery?
This needs more nuance than social media usually gives it.
Ageing does affect muscle physiology, and maintaining muscle mass, strength and physical activity becomes increasingly important as we get older.
But there isn't a birthday at which your body suddenly stops recovering properly.
Research comparing exercise recovery across age groups is complicated, and chronological age alone doesn't tell us how fit someone is, how they train, how well they sleep, what they eat or what health conditions they may have.
A physically active 50-year-old and sedentary 30-year-old aren't interchangeable simply because one is younger.
What often changes during adulthood is the rest of life.
You may have:
More work pressure
Children or caring responsibilities
Less sleep
More sedentary time
Different nutrition
More stress
Less consistent training
Less time for recovery
Then we blame the number on the birthday cake.
Age can be part of the picture.
It isn't always the whole picture.
Training Harder Than Your Body Is Ready For
Exercise creates stress.
For adaptation to happen, you need enough stress to challenge the body followed by enough recovery to adapt to it.
Problems begin when training increases faster than your ability to recover.
Perhaps you increased your running distance.
Then added another gym session.
Then decided to increase the weights.
Then joined a weekend fitness class.
Each change might be perfectly reasonable individually.
Together, you've substantially increased your workload.
This is why changing one major training variable at a time is often sensible.
Your body needs an opportunity to catch up.
Why Leg Day Can Feel Particularly Brutal
Large muscle groups can generate plenty of soreness when they're exposed to unfamiliar resistance training.
Squats, lunges, deadlifts and similar movements can challenge a lot of muscle tissue.
Add slow lowering phases or movements you're not accustomed to and the following 24–72 hours can become interesting.
But again:
More soreness doesn't mean more progress.
You don't need to struggle to sit on the toilet for three days for your legs to become stronger.
A productive strength session can create little or even no noticeable soreness once you're accustomed to the training.
Does Poor Sleep Make Recovery Worse?
Sleep deserves considerably more attention than another expensive recovery gadget.
Sleep loss can impair aspects of physical performance, and a 2025 systematic review found sleep deprivation negatively affected several measures of muscle strength, although the magnitude and consistency varied across studies.
NHS musculoskeletal guidance also identifies poor sleep patterns as something that can contribute to muscle soreness and joint pain.
Think about the whole picture.
If you've trained hard after a stressful day, slept five hours, worked another full day and then trained hard again, your body isn't experiencing those things independently.
They're part of the same recovery environment.
You don't need perfect sleep before you're allowed to exercise.
But consistently poor sleep combined with demanding training can make recovery harder.
What About Protein?
Protein provides amino acids used for maintaining and repairing body tissues, including muscle.
People who train regularly need sufficient dietary protein, particularly when strength training or trying to maintain or build muscle.
That doesn't mean you need an enormous protein shake the second your final repetition ends.
Your overall dietary pattern matters more than treating a tiny post-workout window as an emergency.
Good protein sources can include meat, fish, eggs, dairy, beans, lentils, tofu and other foods depending on your diet.
Supplements can be convenient.
They're not mandatory.
A protein powder cannot compensate for a training programme that's completely outstripping your recovery.
And Hydration?
Hydration matters for health and exercise performance.
But “you're dehydrated” has become a lazy explanation for almost every uncomfortable feeling associated with exercise.
If you've exercised hard in hot conditions and lost substantial fluid through sweat, replacing fluids clearly matters.
That doesn't mean drinking enormous quantities of water magically removes DOMS.
Hydrate appropriately because your body needs fluid.
Don't treat water as a cure for exercise-induced muscle soreness.
Stress Counts Too
Your body doesn't have a separate account for gym stress and life stress.
A difficult week at work doesn't technically count as a set of squats, but it can still affect sleep, energy, motivation and your ability to recover well.
This becomes relevant when someone says:
“I haven't changed my workouts, so why am I suddenly struggling?”
Perhaps the workout hasn't changed.
Everything surrounding it has.
Training doesn't happen in isolation.
Sometimes reducing exercise intensity temporarily during an unusually stressful period is smarter than stubbornly following a programme written for your ideal week.
What About Perimenopause and Menopause?
For some women, this deserves consideration too.
Perimenopause and menopause can coincide with changes in sleep, body composition, temperature regulation, energy and other symptoms that may influence how exercise feels and how easy it is to recover between sessions.
That doesn't mean women should stop training as they approach menopause.
Quite the opposite: maintaining aerobic activity and particularly resistance training remains valuable.
But a programme that worked perfectly several years ago may need adjusting if sleep, symptoms or recovery have changed.
Listen to the information your body is giving you rather than assuming you simply need to “push harder”.
Should You Stretch When You're Sore?
Here's one of the persistent fitness myths.
Stretching after exercise feels good for some people.
That doesn't mean it prevents DOMS.
A systematic review and meta-analysis of randomised trials found post-exercise stretching did not significantly reduce DOMS at 24, 48 or 72 hours compared with passive recovery. The researchers also noted that the available evidence was limited and generally low quality.
So stretch because you enjoy stretching, because you're working on flexibility or because it helps you feel comfortable.
Just don't assume forgetting your post-workout stretch is why your legs hurt two days later.
Does Foam Rolling Work?
This one isn't completely clear-cut.
Some research suggests foam rolling may modestly reduce perceived muscle soreness. A 2024 systematic review and meta-analysis reported an effect on exercise-induced soreness.
Other reviews have found the evidence less convincing, with considerable variation between studies.
So foam rolling can be reasonable if you find it helpful.
What it isn't is mandatory.
If you've been led to believe everyone needs a foam roller, massage gun, compression boots, ice bath and £200 recovery device just to survive ordinary exercise, marketing has done its job remarkably well.
That said, if foam rolling is something you already find useful, you don't need anything complicated. We've included a customer-rated TriggerPoint foam roller in our CardioFire Recommended Gear section so you can compare the product, customer feedback and key features before deciding whether it's worth adding to your recovery routine.
What About Massage?
Massage has somewhat better evidence for reducing the feeling of DOMS.
A systematic review and meta-analysis found reductions in reported soreness following massage after strenuous exercise.
A broader 2025 review of physical therapies also found evidence supporting several recovery approaches, including massage and cooling-based interventions, while noting substantial uncertainty and variation across the research.
The key word is soreness.
Feeling less sore isn't necessarily the same thing as accelerating every aspect of muscular recovery.
That's an important distinction whenever recovery products make big claims.
Does Light Exercise Help?
Often, gentle movement feels considerably better than remaining completely stationary.
Walking, easy cycling or gentle mobility can temporarily make stiff muscles feel more comfortable.
A systematic review found low-quality evidence that active exercise may help manage DOMS-related pain.
That doesn't mean you should attack the same muscles with another brutal workout.
Think movement, not punishment.
A gentle walk the day after a hard leg session is very different from deciding soreness means your legs need another maximal squat workout.
Can You Exercise When You're Still Sore?
Usually, mild ordinary muscle soreness doesn't require complete inactivity.
But use common sense.
If your chest and arms are mildly sore from strength training, a comfortable walk may be perfectly reasonable.
If your legs are extremely sore, your movement is altered and walking normally is difficult, another intense leg session probably isn't a brilliant idea.
You can also train different muscle groups.
Recovery doesn't necessarily mean sitting on the sofa until every sensation disappears.
The goal is to avoid repeatedly overwhelming tissue that hasn't recovered sufficiently.
Soreness vs Pain: Learn the Difference
This may be the most important section in the article.
DOMS usually feels like a relatively diffuse ache or tenderness in muscles that were recently exercised.
Injury can feel different.
Be more cautious about:
Sharp or sudden pain
Pain clearly centred around a joint
Significant swelling
Bruising
Pain that began suddenly during the exercise
Being unable to use a limb normally
Pain that continually worsens instead of improving
Persistent soreness well beyond what you'd normally expect
You don't get bonus fitness points for ignoring pain.
If something feels wrong rather than merely sore, treat it differently.
When Muscle Soreness Needs Medical Attention
Most ordinary post-exercise muscle soreness settles on its own.
But not every case of severe muscle pain after exercise is DOMS.
Seek urgent medical attention if severe muscle pain is accompanied by symptoms such as extreme muscle weakness, difficulty carrying out normal activities, trouble breathing or dizziness. Mayo Clinic also recommends medical assessment for muscle pain associated with signs of infection or pain occurring after starting or increasing certain medications, including statins.
Dark or cola-coloured urine following extremely strenuous exercise, particularly alongside severe muscle pain, swelling or weakness, also requires urgent medical assessment because it can be a sign of rhabdomyolysis.
And if soreness simply isn't improving, keeps recurring unexpectedly or is getting worse, speak to a GP, physiotherapist or other appropriately qualified healthcare professional rather than repeatedly assuming it's DOMS. NHS musculoskeletal guidance similarly advises seeking professional advice when soreness is persistent or worsening.
How Can You Reduce Your Chances of Getting Extremely Sore?
You probably can't eliminate soreness completely.
Nor do you need to.
A better goal is avoiding unnecessary extremes.
Build gradually
Don't increase everything at once.
If you're increasing weight, perhaps don't simultaneously double the number of sets.
If you're increasing running distance, don't also dramatically increase speed.
Expect new exercises to hit differently
Even if you're fit, unfamiliar movements can make you sore.
Treat the first few sessions as an introduction rather than a test.
Return sensibly after a break
Your previous fitness level isn't your current training tolerance.
Start from where your body is now.
Prioritise consistency
Regular exposure to appropriate training allows adaptation.
Occasional heroic workouts followed by five days of being unable to move aren't a particularly sophisticated training strategy.
Eat properly
Your body needs sufficient energy and nutrients to support exercise and recovery.
Protect your sleep
You can't always control it, but sleep deserves to sit much higher on the recovery list than most fashionable gadgets.
Schedule easier days
Not every session needs to be hard.
Walking, lower-intensity cardio, mobility work and lighter training all have a place.
Stop Using Soreness as Your Scorecard
This is probably the fitness habit I'd most like people to drop.
“I'm really sore, so yesterday must have been a brilliant workout.”
Not necessarily.
You could create enormous soreness by performing a ridiculous amount of unfamiliar exercise.
That doesn't make it optimal.
Progress is better measured through things such as:
Getting stronger
Improving endurance
Walking or running farther
Completing the same workout more comfortably
Improving technique
Recovering well between sessions
Training consistently
Feeling healthier and more capable
Those tell you considerably more than how difficult it was to get downstairs this morning.
Why You May Feel More Sore Than You Used To
So let's return to the original question.
Perhaps age contributes.
But perhaps you've changed your training.
Perhaps you've returned after a break.
Perhaps you've increased your workload.
Perhaps you're sleeping badly.
Perhaps work is stressful.
Perhaps you're doing unfamiliar exercises.
Perhaps you're training inconsistently and every session effectively feels new.
Or perhaps several of those things are happening simultaneously.
The answer isn't automatically to train less.
It's to train at a level you can actually recover from.
The Bottom Line
Muscle soreness after exercise is common, particularly after unfamiliar or unusually demanding activity.
It often peaks a day or two after training and then improves.
You don't need to fear it.
But you don't need to chase it either.
If you're finding workouts leave you considerably more sore than they once did, look beyond your age.
Look at your recent training load.
Look at consistency.
Look at sleep.
Look at recovery.
Look at whether you've introduced new movements.
Then adjust one thing at a time.
Fitness isn't about proving how much discomfort you can tolerate.
It's about creating enough challenge for your body to adapt — and enough recovery for that adaptation to actually happen.
And if the pain is severe, unusual, worsening, persistent or accompanied by significant weakness, swelling, breathing problems, dizziness or dark urine, don't write it off as a successful workout.
Get appropriate medical advice.
