Worms move using a combination of muscular contractions and the expansion and contraction of their bodies. They have no limbs or appendages, so they use their muscles to push and pull themselves forward. Earthworms, for example, have longitudinal and circular muscles in their body walls that contract and relax in a wave-like pattern, allowing them to move forward in a burrowing motion. Other types of worms may have different methods of movement, such as swimming or crawling.