Have you ever wondered why, as your fitness improves, your resting heart rate lowers?
It's because, as you gain fitness, the strength of your heart improves and your left ventricle is able to pump a greater volume of blood with each beat. As a result, less beats are needed to keep you going during normal activity.
My resting hear rate is in the 50's - although my blood pressure is still in the 150s / 90s range. Not sure how that happens.
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