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Health & Fitness ²ÝÝ®´«Ã½
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The 411 on heart…
The 411 on heart rate variability: Why it matters, how to track it
June 27, 2016, 6:15 PM
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Your fitness tracker or your gym equipment might check your heart rate, but it might not check a different heart measurement that is important to determine your heart health and fitness level.
Fairfax  Hackley, personal trainer
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