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Rate of perceived exertion

The Borg Rating of Perceived Exertion (RPE) is a way of measuring physical activity intensity level. Perceived exertion is how hard you feel like your body is working. It is based on physical sensations you experience during the physical activity, including increased heart rate, increased respiration or breathing rate, increased sweating and muscle fatigue. Although, this is a subjective measure, a person's exertion rating may provide a good estimate of the actual heart rate during physical activity (Borg, 1998). 

Source: https://www.cdc.gov/physicalactivity/basics/measuring/exertion.htm