When in the "Guard" position, the practitioner is on their back controlling an opponent with his legs. The bottom practitioner pushes and pulls with the legs or feet to unbalance and limit the movements of his opponent. This position allows practitioners a wide variety of counter-attacks from the bottom position, including submissions and sweeps. The three most common types of guards include the Closed Guard, Half Guard, and Open Guard. In closed guard, the bottom grappler has his legs around the opponent's hips, with ankles closed together to control their opponent. The closed guard can be an effective position. This guard allows many setups for submissions such as jointlocks and chokes, as well as sweeps. In the open guard, the legs are not hooked together and the bottom grappler uses his legs or feet to push or pull their opponent. There are many variations of open guard with distinct names and positioning including the Butterfly Guard, De La Riva Guard, X-Guard, Rubber guard, Spider Guard, Octopus Guard, Lapel Guard, Worm Guard (made popular by Keenan Cornelius) and others.