Muscle Soreness or Injury? How to Tell and Recover After 40

Normal muscle soreness is a dull, spread-out ache and stiffness in the muscles you worked, showing up about a day after training and peaking around 24 to 72 hours before it fades. Sharp or stabbing pain, pain in a joint, swelling, numbness or pain that changes how you move is different, and it's a reason to stop and get checked.

Here's what I want you to unlearn: soreness is not a medal, and pain is not a personality trait. Aches and fragility after 40 are mostly learned beliefs. But real warning signs are real, and you don't train through them.

Is it normal to be sore days after a workout?

Yes. That's DOMS, delayed onset muscle soreness. It usually shows up a day after training, peaks around 24 to 72 hours, then fades. It's most common after new exercises, more volume, or slow lowering work, and it gets milder as your body adapts.

So if you can barely walk down the stairs two days after leg day? Classic. Gentle movement, a walk, sleep and your protein meals help.

And if you're NOT sore? It still worked. Soreness fades as you adapt, while progress keeps going. Soreness isn't the goal and it isn't a measure of a good session.

How do you tell soreness from an injury?

These are warning signs. Reasons to stop and get assessed, not to train through:

• Sharp or stabbing pain
• Pain in a joint rather than the middle of the muscle
• Pain on one side only that started at a specific moment
• Swelling or bruising
• Clicking with pain, or a joint giving way
• Numbness, tingling or weakness
• Pain that wakes you at night
• Pain that changes how you walk or move

Sharp pain in your shoulder since Tuesday's press? That's not "push through it". That's book a physio or your doctor.

And chest pain is an emergency. Chest pain or pressure, pain spreading to your arm, jaw or back, unusual breathlessness, fainting, or a racing or irregular heartbeat during or after exercise: stop and call emergency services. Don't train again until a doctor has cleared you.

What if my knees are cranky?

Then your intervals and easy cardio move to a rower, SkiErg or bike, with the same rounds and the same effort. You don't lose the engine because one joint is grumpy.

And for the "running ruins your knees" crowd: hip or knee arthritis was 3.5% in recreational runners vs 10.2% in people who didn't exercise. If the knee is swollen, sharp or giving way, though, stop and get it checked by a physio.

Why are deload weeks important?

Because easy on purpose is where your hard work turns into results.

In PRYME, every 5th week is a deload: no hard interval rounds, everything shorter and easy. Then you retest and start the next block fresh. And this is not a soft option for weak people. In a survey of 246 competitive strength and physique athletes, deloads came about every 5.6 weeks and lasted about 6 to 7 days. They cut sets and reps, lifted lighter and kept more reps in reserve, while keeping the same exercises and training days.

I know. My people hate easy weeks. You'll feel like you're losing progress. You're not. When you're in week 6 hitting a number you couldn't touch in week 4, you'll get it.

Does sleep affect muscle recovery?

Massively. One night without sleep cut muscle protein building by about 18%, raised cortisol about 21% and lowered testosterone about 24% in healthy young men and women. Even a few short nights worsen how your body handles carbs.

"Sleep is optional if I'm disciplined" is not discipline. It's sabotage with good PR.

Alcohol hits overnight recovery too. A moderate dose 6 hours before bed doubled wake-ups in the second half of the night. Alcohol disrupts recovery in everyone, and some studies find it hits women harder. I don't drink, and I definitely wouldn't on the evening after a heavy session.

What should you do on a rest day?

Not the couch. Here's a real recovery day:

• A walk. It counts toward 8,000 steps, and the 10 minute walk after your two biggest meals still applies.
• Gentle mobility for whatever feels tight.
• 5 minutes of breathwork, like cyclic sighing. In a Stanford trial, 5 minutes a day of cyclic sighing improved mood more than mindfulness meditation over a month. Huberman suggests finishing training with 3 to 5 minutes of slow breathing. See the [5-minute breathwork practice](/blog/5-minute-breathwork-practice-hrv-calm).
• One recovery or sleep hypnosis track, headphones in, eyes closed, never while driving.
• Your normal 4 protein meals, 30 to 40 g at each. Recovery days still need protein.
• Same bedtime, done eating about 3 hours before bed.

On the hypnosis piece: in a small pilot of poor sleepers after menopause, home hypnosis recordings improved sleep in 50 to 77% of women (no sham group, so it's promising, not proven). And in women aged 60 to 82 who respond well to hypnosis, a hypnotic suggestion during a lab nap raised deep sleep by about 57%. In 27 years of practice, what I see is that the body recovers a lot faster once the mind stops running the day on a loop. Hypnosis works alongside medical care, never instead of it.

Should I train after a bad night's sleep?

Use readiness, not guilt. Do a quick daily check: how did you sleep, how do you feel, what hurts. Then decide whether today is go hard or ease off. If it says ease off, that's the smart move. Log your symptoms too, so you can spot your own patterns over time.

This isn't medical advice. Sharp pain, swelling, numbness, weakness, an unstable joint, pain at night or pain that changes how you move: see a physio or doctor. Questions about painkillers, sleep medication, melatonin or HRT are for your doctor.

Quick answers

How long does muscle soreness last? It usually shows up a day after training, peaks around 24 to 72 hours, then fades, and it gets milder as your body adapts.

How do I know if it's an injury and not soreness? Sharp or stabbing pain, joint pain, swelling, numbness, weakness, pain at night or pain that changes how you move are warning signs. Stop and get assessed.

Do I need to be sore for a workout to work? No. Soreness fades as you adapt, while progress keeps going.

Why take a deload week? To manage fatigue so your training turns into results. Competitive strength athletes deload about every 5 to 6 weeks.

Can I still do cardio with bad knees? Yes. Do the same intervals on a rower, SkiErg or bike. If a knee is swollen, sharp or giving way, get it checked by a physio.

Sources. Cheung K, et al. Delayed onset muscle soreness: treatment strategies and performance factors. Sports Medicine. 2003. Rogerson D, et al. Deloading practices in strength and physique sports: a cross-sectional survey. Sports Medicine Open. 2024. Lamon S, et al. The effect of acute sleep deprivation on skeletal muscle protein synthesis and the hormonal environment. Physiological Reports. 2021. Alentorn-Geli E, et al. The association of recreational and competitive running with hip and knee osteoarthritis. Journal of Orthopaedic & Sports Physical Therapy. 2017. Balban MY, et al. Brief structured respiration practices enhance mood and reduce physiological arousal. Cell Reports Medicine. 2023. Huberman A. Fitness Toolkit. Huberman Lab podcast. 2022. Cordi MJ, et al. Improving sleep and cognition by hypnotic suggestion in the elderly. Neuropsychologia. 2015.