What does flexion do to the angle of a joint?

Flexion refers to the movement that decreases the angle between two body parts, typically at a joint. For example, when you bend your elbow or knee, you are performing flexion, as the two segments (the forearm and upper arm in the case of the elbow, or the thigh and lower leg in the case of the knee) come closer together. This movement results in a smaller angle at the joint, which is why it is described as decreasing the angle. Understanding this fundamental movement pattern helps in both exercise programming and injury prevention, as correct knowledge of joint mechanics is crucial for maintaining joint health and function.