This workout uses HIIT (high intensity interval training) protocols for training the lower body. HIIT stands for high-intensity interval training, which refers to the short bursts of intense exercise alternated with low-intensity recovery periods. HIIT can burn a lot of calories in a short amount of time and has shown to help with fat loss. It can also help with exercise plateau! In this HIIT workout, exercises are performed at the barre and mat in this workout. Equipment needed: foam mat and one moderate to heavy dumbbell or kettlebell.