Affiliate & partner disclosure: This article contains affiliate and referral links. My WHOOP link is a member referral link: you get a free WHOOP and one month free when you join, and I get free membership time. Hume Health and PerfectAmino links are affiliate links. As an authorised LifeWave Brand Partner, I have a financial interest in promoting LifeWave products. Full disclosure at the end.
A note before we start. This is general information, not medical advice. A run of very low recovery scores with symptoms such as chest pain, breathlessness, dizziness or a racing heart at rest needs a GP, not a rest day.
LifeWave X39 is a non-transdermal, general-wellness phototherapy patch that gently stimulates the skin with light to support the body’s natural energy flow for strength and stamina. It is not a treatment for any condition.
Every morning I check one thing before anything else. My recovery score.
It’s the heart of WHOOP. Understand it properly and the band pays for itself. Misunderstand it and it’s just a coloured number that makes you anxious. Below I’ve included my own numbers from 1,054 days of data.
Key takeaways
- Recovery is scored 0–100% and colour-coded: green (67–100), yellow (34–66), red (0–33).
- It’s driven mostly by heart rate variability, plus resting heart rate, sleep and respiratory rate.
- It compares you to your own baseline, not to other people.
- Over 1,054 days, I’ve been green 41% of the time, yellow 48% and red 11%. Yellow is normal.
- Use it to guide training intensity, not to decide whether to move at all.
What goes into the recovery score?
- Heart rate variability (HRV). The biggest input. It measures the tiny variation in time between heartbeats. Higher than your normal usually means your nervous system is recovered. See why HRV matters.
- Resting heart rate. Higher than your normal often signals stress, illness, alcohol or fatigue.
- Sleep performance. How much you slept against how much you needed.
- Respiratory rate. A jump can be an early sign you’re coming down with something.
WHOOP measures these mostly during your deepest sleep, when readings are most stable.
What do the colours mean?
- Green (67–100%). Your body is ready for hard work. This is the day for heavy lifts or hard intervals.
- Yellow (34–66%). Moderately recovered. Train, but don’t chase records.
- Red (0–33%). Your body is under strain. Walk, stretch, do mobility, sauna. Not a day for a max effort.
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Why is my HRV lower than younger people’s?
Because HRV falls with age. That’s normal. A 50-year-old man will usually sit well below a 25-year-old, and there’s a big range between individuals of the same age. My own median HRV over the whole record is 45 ms. Some men my age sit much lower, some higher.
WHOOP scores you against your own rolling baseline, which is exactly why it’s useful after 40. Forget other people’s numbers. Watch your own trend. See how to improve your HRV.
What does my own data show?
I exported 1,054 days of WHOOP data and looked at what came before my good and bad mornings.
- Short sleep is the biggest hit. After nights under six hours asleep, my recovery averaged 43%. After seven to eight hours, 64%.
- Hard days cost the next morning. After my highest-strain days (17+), recovery averaged 55%. After easy days under 10, 66%.
- Irregular nights cost too. When my sleep consistency dropped below 70%, recovery averaged 54%.
- Illness shows up clearly. On the days I logged feeling ill, my next-morning recovery averaged 55%, against 69% when I didn’t.
Alcohol, late meals and stress are well-known recovery killers in the research. I didn’t log them consistently enough to measure my own numbers, so I won’t pretend I can. More in what 1,054 nights of WHOOP sleep data taught me.
How do I use it day to day?
Simple rules. I lift every second day with the RP Hypertrophy app, and recovery decides the intensity, not whether I train.
- Green: push the session as written.
- Yellow: do the session, keep a rep or two in reserve.
- Red: swap for a long walk, mobility and sauna. My 10,000+ steps still happen.
- Several reds in a row: look at sleep, stress and illness before blaming training.
The bigger picture I watch on my monthly Hume Body Pod scan. If recovery is good and muscle is going up, the system’s working.
When should I ignore it?
Sometimes. If you feel great, slept well and score yellow, a sensible session is fine. Remember: yellow is my most common colour by a distance. If you’re red but life demands you perform, do it, then recover. The score is a guide, not a boss. And don’t let it become a source of stress itself.
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Join free →Frequently asked questions
What is a good WHOOP recovery score?
Green, 67% and above. But consistency matters more than any single day. Most of my days are yellow.
What is a normal HRV for a man over 40?
It varies widely between people. Compare yourself with your own baseline rather than a chart.
Why is my recovery red when I feel fine?
Short sleep, a very hard previous day or an incoming illness can lower it before you feel anything.
Should I skip the gym on a red day?
Not necessarily. Swap intensity for movement: walking, mobility, light work.
How long does it take WHOOP to learn my baseline?
Give it a few weeks of consistent wear before trusting the scores.
Does LifeWave X39 change my recovery score?
No such claim is made. X39 is not intended to diagnose, treat, cure or prevent any disease.
Related reading
Is WHOOP Worth It After 40? · 1,054 Nights of WHOOP Sleep Data · How to Improve Your HRV · Why You Wake Up Tired After 8 Hours
Full disclosure. This article is general information, not medical advice. Personal figures are from my own WHOOP data export (30 November 2023 to 19 October 2026) and are one person’s observations, not a study. My WHOOP link is a member referral link and I receive free membership time when someone joins through it. Hume Health and PerfectAmino links are affiliate links. LifeWave products are not intended to diagnose, treat, cure or prevent any disease. As an authorised LifeWave Brand Partner I have a financial interest in promoting LifeWave products.
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