When a Watch Reading Is Worth a Doctor's Time

It is eleven at night and your watch has shown you a number you do not like. Ten minutes later you are searching your symptoms and feeling worse. Everyone with a wearable has had that evening. The device is not …

Where Your Health Data Lives and How to Move It

You have worn a band for two years. The strap is finished and the battery is tired. You fancy a different brand now. One question stops you. What happens to two years of walking and sleeping? Most people assume it …

Setting Up a Smartwatch for an Older Parent

You bought your father a smartwatch and he wore it for four days. It now sits in a drawer with the box. That is not stubbornness. A watch set up the way you like yours is exhausting for somebody who …

Charging Habits That Keep a Watch Alive All Week

The watch was full on Monday morning. By Thursday night it dies just as you get into bed. So you charge it overnight and lose your sleep tracking. Next week the same thing happens again. A watch battery is a …

Your Watch Buzzes Twice: Fixing Wrist Notifications

You bought a watch so you could stop pulling your phone out. Two weeks later your pocket buzzes, then your wrist buzzes. You check both. Now every message interrupts you twice. The watch has doubled the problem it was meant …

SpO2 and ECG on a Watch: What They Are Not

Two features on modern watches borrow their names from a hospital. One is SpO2 and the other is ECG. Seeing them on a listing makes it sound like your wrist is now a clinic. It is not. Both are worth …

Reading a Sleep Score Without Losing Sleep Over It

You wake up feeling perfectly fine. Then your wrist says you slept badly and gives you a score out of a hundred. By the time you reach the kitchen, you feel tired. That is worth guarding against. Your watch did …

What Your Watch Is Doing When It Reads Your Pulse

Take your watch off at night and look at the back of it. Two or three tiny green lights are still blinking in the dark. They have been doing that against your skin all day. That is how your watch …

Why Your Step Count Never Matches Your Friend's

You and a friend walk the same lane, side by side. At the gate you compare wrists. The numbers are hundreds apart. One of you feels cheated and the other feels smug. Neither device is broken. They simply disagree about …

The First Hour With a New Fitness Band or Watch

The box is open and the band is on your wrist. You want to start walking, not sit through setup screens. Give that first hour anyway. Almost every number you see for the next year rests on what you enter …

Band or Smartwatch? How to Decide Before You Buy

You have decided to buy something for your wrist. Then forty options appear in the shopping app. They all promise the same things. The listing shouts about features you will never open. It stays quiet about the two or three …

What a Fitness Band Can and Cannot Measure

Someone in your family wears a fitness band. It tells them they slept badly, or that they did not walk enough. Most of us take those numbers at face value. But a band does not measure most of what it …