Choose the appropriate weight for the barbell, then sit on the bench and move the barbell up and behind your head. Your feet are shoulder-width apart.
From the starting position rotate your torso to one side. Inhale in the starting position and exhale while rotating to the side. Rotate your torso to the other side and do the required number of repetitions.
Keep your torso upright throughout the movement. Avoid excessive bending at the waist. Focus on doing the movement by contracting the oblique abdominal muscles.
Begin with lower resistance to master the technique well.
This exercise strengthens and builds your oblique abdominal muscles (muscles on the side of your trunk).
The motion involves lower back and is potentially dangerous. Always do this exercise slowly with full control.
Do not turn your head to the sides. Turn only your body with the head facing forward.
You should twist as far as possible but the exercise should never cause back pain.