I test fitness trackers for a living – these are the 5 Prime Day fitness tracker deals I'd buy right now

Amazfit Band 7: was $49 now $39 @ Amazon
The Amazfit Band 7 is a straightforward wearable with all the basic fitness-tracking features you'd expect. Accuracy and battery life both impress, especially for under $40. Weighing just one ounce, it also won't slow you down.

Amazfit Bip 5: was $89 now $67 @ Amazon
The Amazfit Bip 5 is a bit more advanced than the Band 7, sporting a larger screen that gives the device an almost-Apple Watch-like aesthetic. Simple to operate with reliable tracking, this sleek wearable was already a great bargain at $89, as noted in our Amazfit Bip 5 review. It also boasts voice support for Amazon Alexa, a feature rarely offered in fitness trackers under $100. 

Garmin Forerunner 55: was $199 now $168 @ Amazon
The Garmin Forerunner 55 is the brand's entry-level GPS watch for runners and one of the best fitness-tracking watches for beginners thanks to exceptional battery life, advanced fitness metrics and insights, a bright screen, an easy-to-operate user interface and a comfortable design. 

Fitbit Ace LTE: was $229 now $170 @ Amazon
Fitbit's newest kid's activity tracker is $59 off for Prime Day. This comfy-wearing device is perfectly sized for smaller wrists and lets parents keep tabs on their child's location and basic health metrics. Best of all, you and your child can message back and forth with it, for added peace of mind. These features require a $10/month subscription, though.

Google Pixel Watch 2: was $249 now $179 @ Amazon
The Pixel Watch brings Fitbit's top-notch health-tracking tech into a sleek Google-built package with plenty of smarts. Though the Pixel Watch 2 was just replaced by the Pixel Watch 3, it remains a capable and modern smartwatch. In fact, it's barely a year old and offers a similar design and many of the same features as its newer sibling, for less cash.