Conveniently, Prime Day fitness tracker deals (all four days of them) drop right in the middle of summer, which makes this a great time to pick up the smartwatch or smart ring that you just didn't have the cash for at Christmas. Deal hunters should also check out our Best Amazon Prime Day Deals roundup and Prime Day liveblog. The Best Fitness TrackerFitbit has faced pretty stiff competition over the years (most notably from the Apple Watch), but its flagship Charge line is still the best overall fitness tracker for the money. The updated app looks great, and multiple Google integrations make the Fitbit Charge 6 (7/10, WIRED Recommends) easier to use than ever. The Best Kids’ WatchI have personally convinced many parents in my life to buy the Fitbit Ace LTE (7/10, WIRED Recommends) for their kids.