[Dumbbell vertical row] Hold a dumbbell in each hand, with the palms facing the body, bend the elbows and pull the dumbbells up to the chest. Note that the distance between the dumbbells is slightly wider than the width of the shoulders. This can exercise more of the outer deltoid muscles. Non-neck muscles. Choose the right weight and make sure you can do a maximum of 12 to 15 reps per set.