While participating in moderate to vigorous activities, your heart rate should be?
-20-40% of your max. heart rate
-60-80% of your max. heart rate
-80-100% of your max. heart rate
-40-60% of your max. heart rate
-20-40% of your max. heart rate
-60-80% of your max. heart rate
-80-100% of your max. heart rate
-40-60% of your max. heart rate