[1] It is performed by turning the core muscles and back, thereby swinging the arm, which is bent at an angle near or at 90 degrees, in a horizontal arc into the opponent.
[1][2] A hook is usually aimed at the jaw, but it can also be used for body shots, especially to the liver.
Sometimes, depending on style and what feels comfortable to the individual, the lead foot is not pivoted.
Pivoting increases the power of the punch, but leaves one lacking in options to follow up with, such as the right uppercut or right hook.
Several boxers noted for their hooks are Joe Frazier, Bob Foster, Jack Dempsey, Henry Cooper, David Tua, Tommy Morrison, Rubén Olivares, Félix Trinidad, Andy Lee, Sam Hyde and Mike Tyson.