HIIT (High intensity interval training) is an important ingredient in your cardio soup. It is an excellent fat burner, and has an after-burn effect of raising your metabolism and burning more overall calories during the day. Plus. challenges your agility, and makes you feel, well, superhuman! Cardio, as I explain in this article, is important to a holistic approach to health and exercise. HIIT is like an amazing accessory that makes the entire outfit. Read on to get the quickest, most effective workouts you can knock out twice a week. What’s the skinny? This article reviews the best HIIT workouts…