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A snowy pink mountain peak reflected in a calm lake, with wildflowers on the shore.

VO2 max by age: a chart for men and women, and what the decline really looks like

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How accurate are smartwatch calories? What a 2026 lab study found across four brands

Activity tracking

A man sits cross-legged among towering stacks of colourful supplement bottles and pill boxes, examining a small bottle in his hands.

Supplement and drug interactions: CoQ10, St John's wort, turmeric and the combinations to check

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Grapefruit and medication: which drugs don't mix, and why

A single large luminous blue flower with a glowing coral centre rising on a slender stem against a dusk sky over dark blue hills.

Welltory review: what users say, what it does well, and what to know before you start

A quiet shoreline at dusk, a pale path of sand curving along still blue water towards soft pink clouds and dark trees.

Is Welltory free? What you get for free, what Premium adds, and who needs which

A single pale blue flower glowing softly against a deep blue night, rising above dark rounded leaves.

Welltory vs Oura vs WHOOP: an app, a ring and a band compared on cost, accuracy and what you get

A single glowing cornflower rising from soft blue hills under a deep blue night sky.

Welltory vs Bevel: what each app measures, what it works with, and what it costs

Illustration of soft coral and peach clouds rolling under a deep blue evening sky, with a small glowing orange sun low between them.

Google Fit vs Samsung Health: what each one tracks, what is changing in 2026, and which to use

Illustration of tall vertical streams of teal and blue light falling through a night sky onto dark rounded hills, with a small figure standing in a warm pink glow.

Health Connect app: what it is, how it differs from Google Fit, and how to connect your watch

Illustration of a glowing coral cloud curling like a wave over dark blue hills at dusk.

ME/CFS heart rate and HRV: why general norms don't fit and how to find your own normal

Illustration of a person resting on a softly glowing swing seat among blue clouds, eyes closed, in front of a warm coral sun.

How to track fibromyalgia flares with a smartwatch: sleep, heart rate, HRV and a pain diary your doctor can use