Aerobic exercise is sustained physical activity fueled by burning oxygen. The key metrics are heart rate and oxygen use. By convention, aerobic exercise elevates your pulse to between 50 and 70 percent of maximum (most people’s maximum heart rate is between 150 and 200 beats per minute depending on fitness and age).34 Another way to measure exercise intensity is the percentage of the maximum rate of oxygen use, VO2 max. Regardless of how we measure it, aerobic exercise causes breathing that is fast and deep enough to make singing impossible but not hard enough to prevent conversing in normal
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