The document discusses the different types of joints in the human body and how they allow for movement. It introduces three main types of movable joints: hinge joints which allow back-and-forth movement and are found in toes, elbows, knees, and fingers; ball and socket joints which allow a wide range of movement and are located in the hips and shoulders; and gliding joints where bones slide over each other like in the vertebrae of the back bone. Questions are also provided to discuss joints and their functions with a partner.