It’s important to vary a fitness routine with both high- and low-intensity exercises because both have benefits for fat burning, weight loss, and overall health. Low-intensity workouts that gradually increase in intensity over time will help you build your aerobic base. When you build your aerobic base you become more efficient at using fat as a fuel source and you will be able to participate in high-intensity workouts without feeling nauseated or light-headed. High-intensity workouts help you increase the amount of calories that you burn and will increase your metabolic rate, especially for the first two hours after your workout is complete. High-intensity workouts put a greater demand on your muscles, which will create a greater physical response. Both styles of workouts are important and both will help you burn fat, burn calories, and change you physique!