Broke your arm? Exercise the other one to strengthen it
If you have ever broken an arm and had to wear a cast or splint for a few weeks, you will be familiar with the alarming loss of muscle and uneasy feeling of weakness experienced after removing your cast. Most people do not do much exercise while a broken arm is healing and can struggle with this loss of muscle, known as "atrophy," and weakness for many weeks after the injury.
Source: Medical Xpress