The Whoop 4.0 health and fitness monitors adds SpO2 and skin temperature tracking, but suffered from inflated heart rate readings and falsely detected activities in testing.

If you want to get healthy, a fitness tracker can help. At PCMag, we put them through rigorous testing to see which ones are up to the challenge. Here's how we do it.

The third-generation Oura Ring offsets its new monthly membership fee with an upgraded suite of health-tracking features including continuous heart rate measurements, improved temperature sensing, and period predictions.

The Withings ScanWatch is an attractive wearable with long battery life that can take FDA-approved ECG readings, but it's a bit heavy and requires approval from a doctor to use.

The Halo View comes with a one-year app membership and will be available in time for the holidays. Amazon also tipped two new features: Halo Fitness and Halo Nutrition. 

With an always-on color touch screen, a sleeker design, and new health tracking features, the Charge 5 is a significant upgrade over the previous model and Fitbit's best fitness tracker yet.

At $179.99, the Charge 5 costs $30 more than its predecessor, but it features a color touch screen, an always-on display option, and some advanced health-monitoring features found on Fitbit's premium Sense smartwatch.

The sleek, style-forward Fitbit Luxe offers all the basics you want from a fitness tracker in a design that looks more like jewelry than gym wear.

Get one for every member of the family with this limited-time deal.

The attractive Garmin Venu 2 smartwatch offers a large collection of advanced health and fitness features, plus useful lifestyle tools including mobile payments, onboard music storage, and Bluetooth headphone support.

The $149.95 Fitbit Luxe aims to balance function and form with an AMOLED color display, a stainless steel case, up to five days of battery life, 20 exercise modes, 24/7 heart rate tracking, stress management features, and nightly respiration and heart rate variability tracking.

The OnePlus Watch offers an excellent touch screen and some nice health and lifestyle features, but is held back by a lack of third-party app support, GPS issues, and a bulky design.

The stylish Polar Ignite 2 fitness watch tracks your activities, heart rate, sleep, recovery, and offers personalized daily workout guidance to help you train smarter.

The entry-level wearable now offers free access to Bluetooth location technology courtesy of Tile.

The $79.95 Ace 3 kid-friendly fitness tracker builds on its highly rated predecessor with new animated clock faces and longer battery life.

Ideal for small wrists, the Garmin Lily smartwatch has a fashionable, jewelry-inspired design and many useful health-tracking features for a reasonable price.

The slim, affordable Fitbit Inspire 2 offers all the basic activity and sleep features you need from a fitness tracker.

It may be cheap, but the OnePlus Band still promises 14-day battery life and multiple health tracking options.

Strap sensors onto your wrist and leg to capture upper- and lower-body movements.

More than a standard fitness tracker, the Whoop Strap is useful for athletes and anyone else who wants comprehensive insight into their daily activity and health, with personalized coaching to help optimize training and sleep.