45 Min. Total Body Light Dumbbell HIIT Workout | Day 13 - 30 Day Full Body Burnout Vol. 2 This 45 min. fast-paced light dumbbell workout combines strength and HIIT cardio exercises for optimum fat loss and maximum results in minimum time. With over 40+ HIIT dumbbell exercises we're going to really build lean muscle by working every muscle in your body and banging out max reps . Get fit and strong and have lots of fun with this light dumbbell HIIT workout.