High-Intensity Interval Training (HIIT)

High-intensity interval training (also called HIIT) is a type of workout that switches back and forth from intense physical activity to less-intense exercise. You shouldn't do it every day, but it's very effective for weight loss. You’ll burn more calories with HIIT than with steady cardio. The intense exercise keeps your body working and in fat-burning mode for up to 24 hours after your workout ends.