What is the definition of extension in terms of joint movement?

Extension is defined as an increase in the angle between the articulating bones at a joint. This movement typically occurs in various joints throughout the body, such as the elbow and knee, where extending the arm or leg straightens it by moving the joint away from the flexed position. For example, when you straighten your elbow from a bent position, you are performing extension.

This definition is fundamental for understanding human movement mechanics and is commonly observed in physical activities and exercises. Grasping the concept of extension not only aids personal trainers in designing effective workout programs but also helps clients understand how their bodies move through different ranges of motion.