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A powerful metric for measuring workout intensity is observing your heart rate zones. The Apple Watch categorizes your heart rate into five distinct zones based on your maximum heart rate. In the lower zones, primarily zones one and two, your body predominantly burns fat. As you progress to higher zones, particularly zone five, your body shifts to burning more carbohydrates.
Understanding your desired heart rate zone can guide your workouts effectively. For example, I’ve transformed my running route, ending with a steep hill that used to zap my energy. Now, I push myself to sprint up that hill, grabbing a brief glimpse into zone five—a motivating challenge I embrace with my baby stroller in hand.