Which is true about target heart rate?
a. it varies by a person's body weight.
b. people in poor physical condition should exercise above their target heart rate until they are in better shape.
c. it is a percentage of your maximum heart rate.
d. it is a measure of the heart rate after 20 minutes of exercise.?

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During the past few weeks or months, have you noticed any exercises that have become too easy for you? do you think you need to increase the intensity in any of the three exercise areas in your workouts? evaluate your exercise progress in the three exercise areas (cardiovascular, resistance, and flexibility) and list what modifications, if any, you may need to make in your exercise routine.