Holding a dumbbell in each hand, stand with the knees slightly bent. Keeping your back flat and abs engaged, bend forward at the hip joint.
Exhale and lift both arms to the side, maintaining a slight bend in the elbows and squeezing your shoulder blades together. With control, lower the dumbbells back together. This completes one rep.
Perform as many reps as you can in 40 seconds. Rest for 20 seconds.