If you're new to the world of fitness tracking, the Fitbit Blaze is a solid choice. But if you're looking for a smartwatch, or to upgrade anything but a first-generation tracker, the Blaze is unlikely to satisfy.

With the Alta HR, Fitbit updates its most stylish tracker with continuous heart rate monitoring, better battery life, and smarter sleep tracking. Fashion-conscious self-quantifiers: This may be the device you've been waiting for.

The Mio Slice takes an innovative approach to fitness tracking by emphasizing your heart rate rather than steps, though it falls behind in the style department.

Although it has a reliable optical heart monitor, the Philips Health Watch is unintuitive to use and expensive for what it does.

A new collective bargaining agreement prohibits contract negotiators from considering fitness tracker data.

Outdoor enthusiasts may be wooed by the TomTom Adventurer's ability to display preloaded routes, but issues with all-day wear and a few other drawbacks make this fitness tracker less appealing than it could be.

The Withings Steel HR is one of the finest-looking 24/7 fitness trackers with smartwatch features, but it falls short in its heart rate readings.

The clip-on Lumo Run tracks runs and coaches you on how to improve, making it a great value for intermediate level runners.

The Forerunner 620 is an excellent fitness trackers for runners, especially when bundled with Garmin's HRM-Run heart rate strap. It doesn't include any special smart features, however, such as push notifications or all-day step counting.

The Misfit Phase is an attractive fitness tracker in the body of a classic wristwatch, with accurate metrics and just enough smartwatch features to keep things interesting.

Two heart rate sensors are embedded in the fabric, while a GPS sensor goes in a pouch near the collar.

The Motiv Ring can do everything a fitness tracker can…just smaller

The holidays are a great time to fix your sleep problems. With our tips and the right tech, you can sleep better and be more productive in the new year.

They won't bear Google or Pixel branding, though.

A research firm significantly decreased its projection for 2016 sales of smartwatches, fitness trackers, and the like.

The Paris Navigating Gym is powered by energy from passengers' workouts.

As part of the deal, Pebble is expected to stop manufacturing its smartwatches.

The TomTom Spark 3 Cardio + Music fitness tracker provides continuous heart rate monitoring, GPS with route tracking, excellent battery life, and music streaming, all wrapped up in a lightweight, waterproof design.

The Timex IQ+ Move is an attractive timepiece that offers light fitness tracking features in a classic design.

The TomTom Touch is a fitness tracker with a unique body composition feature, but it's hindered by a lackluster, finicky display and some inaccurate results in testing.