A split (commonly referred to as splits or the splits) is a physical position in which the legs are in line with each other and extended in opposite directions. Splits are commonly performed in various athletic activities, including dance, figure skating, gymnastics, contortionism, synchronized swimming, cheerleading, martial arts, aerial arts and yoga as exercise, where a front split is named Hanumanasana and a side split is named Samakonasana. A person who has assumed a split position is said to be "in a split", "doing a split" (for example, a term in the Eastern United States), or "doing the splits" (in the Central and Western United States). When executing a split, the lines defined by the inner thighs of the legs form an angle of approximately 180 degrees. This large angle significantly stretches, and thus demonstrates excellent flexibility of, the hamstring and iliopsoas muscles. Consequently, splits are often used as a stretching exercise to warm up and enhance the flexibility of leg muscles. A split that goes beyond 180° is called an oversplit. Variations There are two general forms of splits: Side splits are executed by extending the legs to the left and right of the torso. Side splits are called straddle splits (or middle splits) in dance and yoga, and may be referred to as Chinese splits in martial arts. Other names include box splits and center splits; in yoga the pose is named Samakonasana. Front splits are executed by extending one leg forward of, and the other leg to the rear of the torso. In dance, a front split is named according to the leg that is extended forward (e.g., the right leg is extended forward when executing a right split). In yoga a front split is called Hanumanasana. Front splits require hyper-extension of the iliofemoral ligament, otherwise the majority of the range of motion must come from the front hip joint. There are many variations of form and performance of splits, including: Oversplit, in which the angle between the legs exceeds 180 degrees. Suspended split, in which the body is static and supported only by the feet. Split leap or split jump is a split that is executed after leaping or jumping, respectively, while still in the air. In figure skating, split jumps are sometimes called Russian jumps. They can be done as an exercise. Standing split or vertical split, in which the leg lines are oriented vertically