45 Min. Total Arm Dumbbell & Bodyweight HIIT Workout | Day 03 - 30 Day Full Body Burnout Vol. 2 This 45 minute upper body workout blends bodyweight and light dumbbell exercises for rapid lean muscle development. We're going to really push our bodies to the limit by cranking out maximum reps per exercise to tone your arms like never before. Think that this dumbbell hybrid workout is for light weights? Think again.