The skeleton is the central structure of the body and is made up of bones, joints and cartilage. The skeleton provides the framework for muscles and gives the body its defined human shape.
The different types of movement that are permitted at each joint are described below.
Flexion – bending a joint. This occurs when the angle of a joint decreases. For example, the elbow flexes when performing a biceps curl.
Extension – straightening a joint. This occurs when the angle of a joint increases, for example, at the elbow when putting a shot.
Abduction – movement away from the midline of the body. This occurs at the hip and shoulder joints during a jumping jack movement.
Adduction – movement towards the midline of the body. This occurs at the hip and shoulder, returning the arms and legs back to their original position from a jumping jack movement.
Circumduction – this is where the limb moves in a circle. This occurs at the shoulder joint during an overarm tennis serve.
Rotation – this is where the limb moves in a circular movement around a fixed joint towards or away from the midline of the body. This occurs in the hip in golf while performing a drive shot.
The table summarises the body locations and types of movements associated with each type of joint.