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Fluids should be room temperature when consumed. Avoid drinking large amounts of cold liquids. Check your pulse To make sure your heart is beating in its target zone, you will need to know how to monitor your heart rate. The easiest way is to feel the pulse in the carotid artery on either side of your neck, between the windpipe and the large neck muscles. Count the number of beats in ten seconds, then multiply by six. This gives you the number of beats per minute. 9 Exercising in your target zon