Don't spend your precious time asking 'Why isn't the world a better place?' It will only be time wasted. The question to ask is 'How can I make it better?' To that there is an answer.

What is Joint Mobilization?

Joint mobilization performed by a physical therapist involves loosening up the restricted joint and increasing its range of motion by providing slow velocity (i.e. speed) and increasing amplitude (i.e. distance of movement) movement directly into the barrier of a joint, moving the actual bone surfaces on each other in ways patients cannot move the joint themselves. These mobilizations should be painless.