Part 3/10:
Zone 2 refers to a training intensity that keeps your heart rate at 60 to 70% of your maximum. This level of exertion feels easy to moderate, allowing you the capacity to sustain longer workouts without exhausting yourself. A primary benefit of Zone 2 training is its efficiency in utilizing fat as the energy source, rather than depleting glycogen reserves. This is crucial since the body can store around 2,000 calories of glycogen compared to more than 100,000 calories from fat.