What is the definition of "extension" in terms of body movement?

The definition of "extension" in terms of body movement accurately describes a straightening motion that increases the angle between adjoining bones. This movement is essential in various physical activities and in understanding how the body functions mechanically. For instance, when you straightened your arm at the elbow or your leg at the knee, you are performing an extension, as you are increasing the angle at those joints.

This concept is crucial when studying physiology and biomechanics, as it helps differentiate between various types of movements such as flexion, which involves decreasing angles. Understanding these definitions is fundamental for professionals working in fields like physical therapy, exercise science, and sports medicine, where precise movements and their effects on the body are a core focus.