Barbell rollouts are a core strengthening exercise for the entire abdominal region. This exercise also improves strength and stability in the shoulders.
Place an exercise mat under your knees and get into a kneeling position. Place a barbell on the floor and grab it with an overhand grip, your hands shoulder-width apart. Your shoulders should be directly over the barbell. This is your starting position.
Keeping your knees in a fixed position, roll the bar out in front of you until your arms fully extend in front of your body. Pause, reverse the direction back to the starting position.
Do not allow your hips to sag at any point during the movement.
Squeeze your abs and glutes throughout the movement for stability.
Move within a comfortable range of motion. You should not strain your lower back.