The Borg scale measures heart beats per minute in order to calculate a precise measurement of workout intensity.

The Borg scale, also known as the Borg Rating of Perceived Exertion (RPE) scale, is a tool used to gauge an individual's subjective level of exertion during physical activity. It is based on a scale from 6 to 20, with 6 being no exertion at all and 20 being maximal exertion.

The Borg scale can be used in conjunction with heart rate monitoring to help individuals better understand their workout intensity and adjust their training accordingly. By correlating perceived exertion with heart rate data, individuals can tailor their workouts to achieve specific training goals, such as improving cardiovascular fitness or increasing endurance.

Monitoring heart rate and using the Borg scale can help individuals ensure they are training at an appropriate intensity level to achieve their fitness goals, while also preventing overexertion and potential injury. By incorporating these tools into their workout routine, individuals can optimize their training and make progress towards their desired fitness outcomes.