8. To attain the maximum cardio-vascular benefits, you should dance at an intensity that raises your heart rate from 60% to 80% of your PMHR. Determine the Target Heart Rate (THR) of a 17-year-old boy who wants to engage in social dancing activity for fitness improvement, a. 128 - 162 beat/minute c. 122-163 beats/minute b. 122 - 162 beats/minute d. 126 - 165 beats/minute