If you’ve been eyeing this sleek and minimalist fitness tracker, act fast—this limited-time Prime Day deal won’t last long.

Get 15% off the Oura Ring 3 and Oura Ring 4 (newest model) during the final day of Prime Day today, in all shades and sizes.

I wasn’t a fitness-tracker person—until I tried the Oura Ring. I’d tested both a Fitbit and an Apple Watch, but I never liked ...