This exercise targets the rotator cuff muscles, located underneath the shoulders. These muscles are responsible for keeping your arm from slipping out of its socket and are very susceptible to injury.

At about two and a half years old, she may throw a ball at body level (Sheridan 2008). At three years old, she may throw a ball overhand and be able to catch a large ball (Einon 2006, Sheridan 2008) .