Which of the following best describes physiological movements?

Physiological movements are defined as those movements that occur as a result of active muscle contractions. When muscles contract, they pull on bones and allow for various ranges of motion around joints, enabling us to perform tasks and activities. Therefore, the description of physiological movements as involving active muscle contraction that moves an extremity accurately reflects the nature of how these movements are produced in the body.

These movements are essential in athletic training and rehabilitation, as they are fundamental to understanding how the body functions during activity. The other options do not capture the essence of physiological movements. For instance, passive stretching implies that the motion occurs without active muscle engagement, while movements generated by external forces involve no voluntary muscle contraction. Lastly, movements that involve joint immobilization do not fit the definition, as physiological movements require joint mobility and muscle activity to function effectively.