Knowledge is power when it comes to performance, these picks help you get it.

Whoop vs. Fitbit Air: I compared Google's new fitness band to the industry favorite ...

All products featured here are independently selected by our editors and writers. If you buy something through links on our site, Gizmodo may earn an affiliate commission. Reading time 7 minutes ...

I was curious how the accuracy on the arm band HRM compared to a traditional chest strap. Could it compete? But I’m lucky/unlucky. Because of some fun health issues, I have a hospital-grade Holter ...

Tracking your heart rate with a heart rate monitor (HRM) during your runs is one of the most powerful ways to optimize your training, whether you're a dedicated marathoner, power triathlete, or just ...

We may receive a commission on purchases made from links. When smartwatches and other wearables first hit the market, some people were skeptical that they'd be anything more than a novelty. Once users ...

Brand experts explain that wearable devices' reliability for metrics like distance, heart rate and sleep are continually ...

The Wahoo Trackr Heart Rate represents a complete redesign of the company's HR straps, including a new built-in rechargeable battery. The upgraded device boasts seemingly perfect heart rate accuracy ...

How small is the Fitbit Air? The Fitbit Air is the smallest tracker in Google’s current Fitbit lineup. It measures 34.9mm long, 17mm wide, and 8.3mm thick. The pebble alone weighs 5.2 grams, while the ...

If your Fitbit Charge 6 is giving you heart rate readings that are clearly wrong — showing 85 BPM during a HIIT workout when you’re gasping for air, spiking to 200 BPM while you’re sitting on the ...