barbell seated twist

Sit on a flat bench with your feet flat on the ground and your knees bent. Hold a barbell with both hands in front of your chest, keeping your elbows slightly bent. Engage your core and slowly twist your torso to one side, keeping your back straight. Pause for a moment at the end of the twist, then slowly rotate back to the starting position. Repeat the twist to the other side. Continue alternating sides for the desired number of repetitions.