Jaybird Reign fitness tracker review - Ars technica

A lot of popular fitness trackers aren't very active at all. They sit on your wrist counting each step you take, how long you sleep, and maybe a few workouts here and there. Jaybird's $150 Reign tracker is trying to do something a bit different. Instead of focusing on steps, Reign gets to know your body when it's both fatigued and recovered from strenuous exercise. It uses heart rate variability to tell you if your body is ready for physical activity, and it determines how much activity you should aim for when you want to push yourself further each day. Since it's not your typical smart pedometer, there is a slight learning curve when first using Reign, but it's an interesting option for those who believe stagnancy is just as harmful to your health as immobility.

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