If you're looking for a fast, efficient workout that can help support your weight-loss goals, can we suggest HIIT? HIIT involves alternating short bursts of intense exercise with lower-intensity recovery periods. The method can be an effective way to burn fat and lose weight. Especially if you're short on time or get bored just thinking about doing cardio for an hour straight. Try this seven-day HIIT workout plan that can help you start working toward your fitness and weight-loss goals.