Make This One Tweak To Banish Rounded Shoulders—And Prevent Pain or Injury

Rounded shoulders—when your shoulders have the appearance of rounding forward due to your shoulders sitting forward and down—are incredibly common. "It can be caused by muscular weakness or muscular imbalance," says trainer Astrid Swan. "It means the upper trapezius and levator scapula become strained while the major and minor pectoralis muscles are tight and shortened."