When it comes to fitness trackers, the Fitbit Charge 4 is the best: it has built-in GPS, new health features, and is on sale for the lowest price ever.

For a limited time, Amazon is selling the Fitbit Charge 4 for $129. That's a $20 discount and the lowest price ever for this tracker. It is also one of the best Fitbit deals we have seen this month.

The Editor's Choice Fitbit Charge 4 is the best Fitbit you can buy. This is mainly due to the fact that the Charge 4 is the first Fitbit with built-in GPS, which allows for more accurate tracking when running, cycling, and swimming.In our review of the Fitbit Charge 4, we also reviewed the new Active Zone Minutes, a We also liked the many new features, including a new fitness metric called Active Zone Minutes. Various health advocates recommend that you exercise your heart above your normal heart rate for at least 150 minutes each week, and the Charge 4 is designed to track that and let you know when you need to get out more.

It also features Fitbit's SPO2 sensor for better sleep tracking, which can tell if you're not getting enough oxygen when you doze off or if you may have sleep apnea. The Charge 4 also includes Fitbit Pay, which can be used as a contactless payment method at merchants.

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