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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]].]]
[[Heart Rate ]] Reserve (HRR) is the difference between your [[Maximum Heart Rate]] (HR<sub>max</sub>) and [[Resting Heart Rate]] (HR<sub>rest</sub>). Exercise intensity can be evaluated by comparing your heart rate as a percentage of HRR.
=Calculating Heart Rate Reserve=
The calculation to work out %HRR is (HR<sub>ex</sub> – HR<sub>rest</sub>)/(HR<sub>max</sub> – HR<sub>rest</sub>), where HR<sub>ex</sub> is the exercise [[Heart Rate]]. For example a HR<sub>max</sub> of 180, a HR<sub>rest</sub> of 40 and HR<sub>ex</sub> of 140 would be (140 – 40)/(180 – 40), which is 71%.
=Why %HRR rather than %HR<sub>max</sub>=
Using %HRR is better than a percentage of HR<sub>max</sub>. as it reflects the relative intensity more accurately. For example, if two athletes both have a HR<sub>max</sub> of 180, but one has a HR<sub>rest</sub> of 40 and the other 70, at HR<sub>ex</sub> of 140would be same %HR<sub>max</sub>, but one is at 64 %HRR and the other is at 71 %HRR.
