Display your activity (and sleep) and receive a "Health" percentage.
The "Health" percentage gives you a completion percentage of all three rings combined.
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The red ring, shows you your active calories burned. (Default goal of 300 active calories)
The green ring, shows you your active minutes. (Default goal of 60 minutes or 1 hour)
The blue ring, shows you your sleep minutes. (Default goal of 480 minutes or 8 hours)
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Each goal is customizable with rings that go darker when goal is met.