2. Determine the Heart Rate Reserve. HRR = MHR - (Resting Heart Rate) (Please refer to Self-testing activities) HRR= 3. Take 60% and 80% of the HRR a. 60% x HRR = b. 80%x HRR = + 4. Add each HRR to Resting Heart Rate (RHR) to obtain the Target Heart Rate (THR) range. a. 60% HRR beats per minute (RHR) b. 80% HRR beats per minute (RHR) + to beats per minute. Therefore, your target heart rate range is (4.a) (4.b)​