As we age, the skin on our arms sags, so-called ears appear under our arms, and we can no longer wear sleeveless dresses. As we age, the skin on our arms sags, so-called ears appear under our arms, and we can no longer wear sleeveless dresses. To avoid this, it is enough to train the deltoid muscles 2-3 times a week. Exercise 1 Take dumbbells or thick books, sit on the edge of a chair - your back is straight, your legs are together and your knees are bent at a right angle.