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What Is Cortisol and Can a Smartwatch Help You Manage It?

Cortisol gets a genuinely bad reputation as simply "the stress hormone," but the biological reality is considerably more nuanced than that popular framing suggests, and it's worth understanding pro...

What Happens to Your Body During Sleep: The Biology Behind Your Sleep Data

Your COLMI watch or ring shows you sleep stages, total duration, and a composite score each and every morning, but what's actually happening deep inside your body while you're genuinely unconscious...

What Is a Sleep Score? How It's Calculated and What It Actually Means

Wake up, check your watch, and there it is: a single number summarising how well you slept. Sleep scores have become one of the most-checked stats on any wearable, but the way they're calculated is...

The Truth About 10,000 Steps a Day: What Science Actually Says and How Your Smartwatch Can Help

"10,000 steps a day" is one of the most widely repeated health recommendations in existence. It appears on fitness tracker packaging, in GP waiting rooms, in school PE curricula, and in virtually e...

Can a Smartwatch Help You Sleep Better? What the Research Actually Says

The marketing around smartwatch sleep tracking is confident and compelling: wear the device to bed, see your sleep stages, improve your health. But sleep is one of the most complex physiological pr...

How Wearables Can Help You Manage Work Stress: A Science-Backed Guide

Workplace stress has become one of the defining health challenges of modern professional life. The UK Health and Safety Executive estimates that stress, depression, and anxiety account for over 50%...

The Science of Sleep: What Your Smartwatch Data Is Actually Telling You

Every morning your COLMI smartwatch or smart ring gives you a sleep score. Maybe it's a 74, maybe it's an 88. Light sleep: 3 hours 12 minutes. Deep sleep: 1 hour 5 minutes. REM: 1 hour 40 minutes. ...

How to Use Your Smartwatch to Lose Weight: A Realistic, Data-Driven Guide

Smartwatches and smart rings are among the most popular purchases people make when they decide to lose weight or get healthier. And with good reason — wearable technology gives you objective data a...

How to Improve Your HRV: A Practical Guide Using Your Smartwatch Data

Heart rate variability — HRV — has quietly become one of the most talked-about health metrics in both elite sport and everyday wellness. Athletes use it to optimise training loads. Researchers use ...