After a stroke, a person may have trouble using all or part of their body. Often, the arm and leg on one side can be weak, numb, or stiff. The inability to move a limb or body part after stroke is called paralysis. Muscles may also tighten up, making it difficult to stretch. This is called spasticity. Improving posture, range of motion, and strength are early treatment goals. Together, the rehab team can help the person progress from sitting to standing and walking.