There is a woman aged 23. Her maximum heart rate is . Her resting heart rate is 66 bpm. A.197 B.168 C.158 D.154 THIS BELOW WAS GIVEN AS AN EXAMPLE... Lower Limit Heart Rate Zone First, we will calculate the lower heart rate zone. 220- age= Maximum heart rate (MHR) MHR- resting heart rate (RHR)= calculation (C) Now, we use our low zone %, so (C) x .60 (lower zone) + RHR = lower limit target heart rate Maximum Heart Rate Zone First, we will calculate the lower heart rate zone. 220- age= Maximum heart rate (MHR) MHR- resting heart rate (RHR)= calculation (C) Now, we use our low zone %, so (C) x .80 (upper zone) + RHR = upper limit target heart rate