In the context of physical therapy, "block" can refer to several things, including a yoga block, which helps improve flexibility and strength and relieve back and joint pain; a tap block injection, used to relieve pain after cesarean sections; or block disease, a neurological movement disorder. The significance varies depending on the context; an exercise block helps modify positions and increase depth; a tap block injection reduces the need for pain medication and speeds recovery; block disease is a medical condition that requires specialized diagnosis and treatment.