Heat is notoriously hard on humans and wildlife. Data from Oura rings reveal troubling health impacts of recent US heatwave: 'More fragmented' first appeared on The Cool Down.

If you’re curious about what happens while you sleep, a tracker might be for you. These are our favorite rings, watches and ...

The Amazfit T-Rex 3 and Garmin Venu 3 are also top-notch choices for the outdoorsy crowd, with their accurate fitness tracking, long battery life, and excellent readable displays. The Venu 3 offers ...