Assume the position
Assume the position is a command that instructs a person to prepare themselves for receiving corporal punishment on their buttocks by assuming a defined spanking position. The command is typically used in the context of a formalized chastisement, such as in a school setting or in the context of fraternity and sorority spanking.
The typical position to assume is bent over, with their hands holding onto their knees or ankles. The chastisement given is usually either a caning (such as the classic "six of the best") or a paddling.
Two mainstream films that show this command (and position) being used during fraternity and sorority paddlings are Animal House (1978) and Sorority Babes in the Slimeball Bowl-o-Rama (1988).