The barbell press sit-up is a weighted exercise focusing on the abdominal muscles, as well as the shoulders to a lesser degree. It primarily targets the rectus abdominis or "six-pack" muscles, but also involves the obliques and deep core muscles. It can be performed on the floor with the feet anchored or unanchored, or on a decline or other bench. It is similar to the Otis-up, which is performed with a weight plate.