Each twin controls one arm and one leg. As infants, learning to crawl, walk, and clap required cooperation. They can eat and write separately and simultaneously. Activities such as running, swimming, hair brushing and driving a car require coordinated action.Abby and Brittany Hensel are conjoined twins. The two became household names after they let the media into their unique lives for a program on TLC. The twin sisters share the same body but have several organs that are different. They do not share a heart, stomach, spins, lungs or spinal cord.