Sit on the floor with your legs fully extended in front of you. Place your hands on the ground between your hips and knees; the further forward you place your hands, the harder the exercise becomes. Keeping your legs straight and toes pointed, engage your core and hip flexors to lift your feet off the ground. Lower them back down with control. Ensure your back remains slightly rounded to maximize abdominal engagement and focus on pulling your quads toward your chest.