Which muscle movement is characterized by decreasing the angle between two body parts?

The movement characterized by decreasing the angle between two body parts is known as flexion. This action typically occurs at a joint where one body part moves closer to another, effectively reducing the angle that exists between them. For example, when you bend your elbow, the forearm moves towards the upper arm, demonstrating flexion at the elbow joint. Similarly, bending the knee or bringing the trunk forward when sitting up from a lying position are both examples of flexion.

Understanding flexion is essential in the context of Pilates and body mechanics, as many exercises involve flexing various joints in order to strengthen muscles, improve flexibility, and enhance overall movement patterns. This foundational concept plays a crucial role in many of the movements performed within Pilates, which aims to promote controlled and precise movements throughout the range of motion.