IT'S A REST DAY: A heart rate monitor is a very useful tool for measuring exercise intensity. HR monitors are highly recommended for this training program. They'll make it easy for you to measure intensity and will let you learn the association between HR and perceived exertion (how you feel). Measuring your pulse manually via your wrist or carotid pulse (neck) is not very accurate, especially at high exercise intensities. Good monitors are available for under $100.
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