Short on time but still want an effective strength workout? This Vital 10 Upper Body Circuit uses four powerful dumbbell combinations to train your arms, shoulders, back and chest in just 10 minutes. All you need is a pair of light-to-moderate dumbbells and a little space to move. THE CIRCUIT: Lat pulldown — alternating reps + doubles Serve-a-tray — forward + lateral Chest fly + triceps kickback Wide biceps curl + external rotation These combination exercises allow us to trai