Parkinson's disease may also cause episodic freezing of muscles, which is more severe than rigidity. This usually involves the muscles that are already the most rigid, though it does not affect ...

Folks with Parkinson’s disease often have trouble walking and even experience freezing or falls as the disease progresses.

difficulty lifting one's feet ("freezing") particularly when turning, stiffness of neck and trunk muscles, slowness of movement, and inability to look down at the floor. Instead of turning “en bloc”, ...