Best Black Friday fitness tracker deals

You know her and you love her. The Oura Ring is the most popular smart ring ZDNET readers bought this year -- and for good reason. The ring accurately tracks sleep, stress, and activity, and each morning delivers daily scores on these metrics. The daily feedback can encourage healthy habits. For example, after over a year of wearing the ring, I started to implement better habits that supplement sleep quality. This includes avoiding casual drinking and later meals. 

The smart ring also charts your daily heart rate on a trend map that categorizes different heart rate zones into restored, relaxed, engaged, and stressed. It then takes this daily heart rate data to understand your cumulative stress, that is, how your body bounces back from its daily stressors over time. Another unique feature is Symptom Radar, Oura's tool for monitoring potential strain or illness and alerting you right ...