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TODAY, DO AN OVERDISTANCE (OD) RUN FOR 25 MINUTES AT LEVEL 1 INTENSITY: A HR monitor is a very useful tool to measure the intensity of exercise. They are highly recommended for this training program. They will take make the measurement of intensity very easy and allow you to learn the association between HR and perceived exertion (how you feel). Unfortunately, measuring your pulse via your wrist or carotid pulse (neck) in not very accurate, especially at high exercise intensities. Good monitors are available for under $100.
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