One great deal we’ve found today is on the immensely useful Fitbit Charge 6 fitness tracker. This handy device can be a huge boon for your health, and while it’d normally set you back $160, this Prime Day deal knocks it down by 38% to just $100.

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.

One important thing to know is that the Oura membership, which costs $5.99 a month, unlocks the full range of insights, including daily readiness scores, sleep and stress tracking, and period predictions. But with this Prime Day deal, the $52 savings on the black Oura Ring 4 could cover nearly nine months of membership.