Currently, the Fitbit Charge 6 is available at its lowest price of the year for Amazon Prime Day (which runs from July 8 to 11), making it an easy way to stay active and potentially claim some bragging rights along the way. Remember, if you don’t have an active Prime subscription, you can sign up for a free 30-day trial here. The Charge 6 is a gym rat’s best friend and one of the best Fitbits you can own. It records all the stats you need with automatic exercise recognition, all-day activity tracking, sleep scores, cardio fitness scores, and other advanced health metrics. The Fitbit Charge 6 works best with Android devices, and some of its features—including a workout library and personalized tips for better sleep—require a Fitbit Premium subscription.