Low Impact HIIT Workout This low impact HIIT Workout Burns Fat & Won't Hurt your Knees & Back! You may have heard that HIIT workouts are great for fitness and metabolism. They are! Unfortunately, most HIIT workouts are tough on the knees and low back. That's why I'm sharing this quick low impact HIIT workout with you. It boosts metabolism and burns fat in 20 minutes. The HIIT exercises are no impact so you don't have to worry about hurting your knees or your back. Low Impact HIIT Workout Pin this workout to Pinterest so you'll have it forever