Discover The Benefits Of HIIT – Online - In this online High Intensity Interval Training (HIIT) course, you will learn how the Pros teach people how to get fit fast. High Intensity Interval Training lets you get more fit, in less time. This is not a training on specific HIIT exercises, but rather is designed to give you a thorough understanding of the benefits and central concepts of HIIT Training. Inside this training you will learn what HIIT is and details about the many benefits of the HIIT Fitness System. High Intensity Interval Training lets you get more fit, in less time. Here are just a few of the main benefits of HIIT: Burn calories Increased endurance Fat loss Build muscle Improved intensity/focus Increased strength Better cardiovascular health.