Joints do not only hinge — the surfaces glide and roll against each other. When that accessory movement is lost, usually after injury or a long period of not moving, the joint feels stiff or blocked even when the muscles around it are fine.
Peripheral joint mobilisation means the joints of the limbs: shoulder, elbow, wrist, hip, knee, ankle. Small, controlled, rhythmic movements are applied at the joint to restore that glide.
What it feels like
Gentle and rhythmic — nothing sudden, and no manipulation or clicking. It should not be painful. Range often improves immediately, though it usually takes several sessions plus exercises to hold.
Often paired with soft tissue work
A stiff joint and tight muscles usually arrive together. Releasing the tissue first tends to make the joint respond better.