How Heart Rate Zones Work

shared by pacificfit on Sep 20, 2013 in Health

How Heart Rate Zones Work

shared by pacificfit on Sep 20, 2013 in Health

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Become smarter than 99% of the endurance athlete population when it comes to truly understanding how your body, muscles and energy systems truly operate when you train in these different zones. Ben Gr...
Category: Health

Publisher:

Ben Greenfield
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