Here is an example of finding the Target Heart Rate Zone of a 15 year-old student:
MHR: 220-15 = 205 Lower Limit: 70% of 205 = 143.5 .70 X 205 = 143.5 Upper Limit: 90% of 205 = 184.5 .90 X 205 = 184.5 So the Target Heart Rate Zone for this student is 143.5 to 184.5 beats per minute
So we can easily remember the THR for PE1, we will say:
THRZ = 140-180 beats per minute