2. Resting Heart Rate (DAILY)
WHAT IT MEASURES: The number of heartbeats per minute.
WHY IT’S KEY: It reflects the health and efficiency of your circulatory system. “Lower beats per minute indicate your heart is pumping more blood per beat, so it needs fewer bpm to circulate blood and oxygen,” says Myles Spar, an integrative physician and NBA adviser. A study in the British Medical Journal finds that a resting heart rate of 90 to 100 bpm tripled the risk of death compared with a lower rate. Use a tracker, or do it the old-fashioned way, counting your pulse on your wrist for 15 seconds and multiplying by four.
AIM FOR: 60 bpm (or in the 50s for athletes).
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