A movable joint is the most common type of joint in the human body, and freely moving ones are found wherever movement is important.They are more commonly known as synovial joints because each contains synovial fluid — a liquid that helps to decrease friction when the joint moves.here is also a layer of hyaline cartilage in the joint that again allows for smoother movement. Ad. Each kind of movable joint throughout the human body provides a different type of movement. For example, pivot joints, such as those found in the neck, allow a person to move his or her head sideways.