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[[File:HeartRateSimplified.png|right|thumb|500px|A simplified chart of heart rate against exercise intensity showing [[Maximum Heart Rate]], [[Heart Rate Reserve]], [[Resting Heart Rate]] and [[Heart Rate Deflection]].]]
Resting Heart Rate (HR<sub>rest</sub>) is how fast your heart beats when you are not expending any energy beyond simply being alive. Finding your HR<sub>rest</sub> is easy; just check your heart rate while sitting still or lying down. Early morning is a good time, before any exercise or taken caffeine[[Caffeine]], both of which will raise your HR<sub>rest</sub>. A low HR<sub>rest</sub> is normally a sign of fitness, as endurance training tends to increase the size of your heart, and a large heart needs to beat less often to pump the same amount of blood. HR<sub>rest</sub> is used to calculate [[Heart Rate Reserve]]. (Sometimes Resting Heart Rate is called Basal Heart Rate or HR<sub>b</sub>.)
=Measuring Resting Heart Rate=
