The black and silver versions of the smart ring are on sale for $297, while the brushed silver and dark gray colors are on ...

Of all the activity trackers, the Link appears to be the most accurate at tracking calories burned. To track that data though, you have to pay for a $6.95-a-month subscription for the online ...

If walking is your main form of physical activity, see how activity trackers can help you set and achieve your fitness goals.

Activity tracking is what Fitbit does best, and the Inspire 3 makes it easy. There are over 20 different workouts to choose from (including run, bike, swim and treadmill), ...

Some activity trackers, such as the Garmin Vivofit ($129.99), work with an optional chest strap monitor ($169.99 for the bundle). THEY TRACK SLEEP, TOO.

High-tech fitness and activity trackers all share one thing: an accelerometer. Here’s how they work — and don’t. Accelerometers record changes in motion relative to the device: up and down ...

Wrist-worn activity trackers are more prone to errors when we vigorously move our arms during the day, he said. But it also depends on what you're trying to measure: To track lower-limb activity like ...

The activity tracker can also be distracting with its audible reminders to get up and move or telling you to drink more water. After a while, you may just decide to turn it off and throw it in a ...

The Withings Pulse: Best activity tracker for tracking sleep Don’t let this unassuming black rectangle fool you — it’s packed with some nice features. First off, the Pulse holds a charge for ...

Designed to track activity, heart rate, and sleep, the ring can be worn 24/7, even in the shower. The Motiv ring started shipping in September and costs $199.

An activity tracker with the heart of a smartwatch Now there's the Vivosmart, an activity tracker that can receive vibration alerts for phone calls, text messages and emails from your smartphone.

Activity tracking can be beautiful, and it doesn't require a screen or a battery. Emulsion is an "analog activity tracker" from Norwegian design studio Skrekkøgle.