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Find health guides and all information on metabolic health to feed the curious you.
How the Ultrahuman Ring tracks cycle temperature
The Ring reads skin temperature continuously overnight and reports deviation from your own baseline. How that works, how accurate it is, and where it …
Sep 21, 2026
Basal Body Temperature (BBT) explained
What basal body temperature is, how it shifts across your cycle, how to chart it properly, and what a missing temperature rise means.
Sep 21, 2026
How to get more REM sleep explained
What REM sleep does, how much you actually need, and the habits that measurably increase it – based on sleep-stage data from Ultrahuman Ring members. …
Sep 19, 2026
How the Ultrahuman Ring tracks sleep stages
How the Ultrahuman Ring identifies light, deep and REM sleep from pulse, movement and skin temperature, and how to read the results.
Sep 16, 2026
REM sleep explained: Discover what causes low REM nights
What REM sleep is, what it does, how much is normal by age, and the most common cause of lost REM
Sep 16, 2026
Why a late bedtime still leaves you tired – even after 7 hours' sleep
Going to bed after midnight can still leave you tired, even with a full night's sleep. It's all to go with your circadian rhythm
Sep 15, 2026
VO2 Max explained: Why it's the leading predictor of long-term health
VO2 max measures how well your body uses oxygen during hard exercise, and it's one of the strongest predictors of long-term health there is.
Sep 14, 2026
Introducing improved VO2 Max on Ultrahuman Ring
Ultrahuman's VO2 max estimate is now calibrated directly against gold-standard lab testing (CPET). Here's what's new, and why your score may change.
Sep 14, 2026
VO2 Max: What is a good score for your age?
VO2 max is one of the strongest known predictors of long-term health – but almost nobody gets it lab-tested. Here's what a good score looks like by …
Sep 14, 2026