Interval training affects metabolism by alternating periods of high-intensity exercise with low-intensity recovery. This approach boosts the afterburn effect, whereby the body continues to burn calories post-workout as it recovers. Interval training increases the overall calorie burn and improves insulin sensitivity, which can enhance fat loss and muscle preservation. Regular incorporation of interval training into a fitness regimen can boost aerobic and anaerobic capacity, making workouts more efficient and effective for improving overall fitness and metabolic health.