I test fitness trackers for a living – these are the 4 Prime Day fitness tracker deals I'd buy right now
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.