Answer:
50-70%
Step-by-step explanation:
Exercise intensity is a measure of the correlation of the physical activity to the exercise feelings you feel while you perform the exercise.
The exercise intensity is reflected in the heart rate and breathing rate of trainer which could differ from person to person.
The heart rate is prefered over the breathing rate to calculate the exercise intensity. The American Heart Association has recommended a target heart rate for the workout which is 50 -70% for moderate exercise and 70-85% for vigorous exercise.
Since the aerobic exercise is considered the moderate exercise therefore the exercise intensity should lie between 50-70%.
Thus, 50-70% is the correct answer.