Wrestling holds include a number of moves used by competitors to immobilize their opponents or lead to a submission. Also known as stretches (or submission holds), these techniques are employed to weaken an opponent or to force him or her to submit, either vocally or by tapping out: slapping the mat, floor, or opponent with a free hand three times. Moves are listed under general categories whenever possible. Chokes, although not in general stress positions like the other stretches, are usually grouped with stretches as they serve the same tactical purposes.