Fitbit Inspire 3 Fitness Tracker BlackKey Features Daily Readiness Score (Premium only) Based on your stress, sleep & activity, Daily Readiness Score tells you what your body can handle so you can dial your workout plans up or down. Because when you listen to your body, you see better results. 7 24 7 heart rate Watching your heart rate during exercise lets you know when youre in fat burn, cardio or peak zones so you know how hard youre working. The more you can comfortably push yourself,
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