"An alternative to using heart rate methods is the RPE method of measuring exercise intensity. However, it is difficult to give a general recommendation for RPE, as it is by its very nature open to personal interpretation; what I consider to be a 12 may be different to what you consider to be a 12. RPE can be a useful way of measuring exercise intensity when heart rate monitoring is difficult or inappropriate. For example, some types of medication, such as beta blockers given to people with hypertension, lower the heart rate, and therefore heart rate measurement is not appropriate for people on this type of medication. The Borg Rating of Perceived Exertion (RPE) Scale is one way to measure perceived exertion. In medicine, this is used to document the patient’s exertion during a test, and sports coaches use the scale to assess the intensity of training and competition. The original scale introduced by Gunnar Borg rated exertion on a scale of 6–"