If a limb is not exercised will the related muscle lose strength?

Yes, if a limb is not exercised, the related muscles will lose strength over time due to a process called muscle atrophy. This occurs because muscles require regular use to maintain their size and function; without stimulation, the body breaks down muscle tissue for energy. Consequently, prolonged inactivity can lead to decreased muscle mass and strength. Regular physical activity is essential for preserving muscle health.