This exercise works the oblique muscles. It is a high-injury exercise.
Sit down on a bench. Legs should be apart with toes pointed out. Press the glutes tightly to the bench and fix them.
Place the bar on the trapezoids.
As you exhale, turn your torso from one side to another by twisting the waist. Keep your pelvis stationary.
As you inhale, return the torso to the starting position.
It's one of the most dangerous exercises for the lower back. If you have lower back pain, this exercise is forbidden.