what heart rate becomes unhealthy during cardio
These fitness machines can read the chest straps and display the heart rate on the equipments' keypad. Either heart rate monitor is a more accurate than an exerciser manually taking his cardio pulse rate in the middle of exercise. Stage One: 60% to 70% of Maximum Heart Rate. Sometimes called the cardio fat burning zone, the first heart rate stage is between 60% and 70% of maximum heart rate.