This exercise will help to strengthen your core and pelvic floor. Begin by lying flat on your back with your knees bent and feet on the floor. Place your arms alongside your body with palms facing down. Next, engage your pelvic floor and lift your legs up at a 90-degree angle. Inhale and gently separate your thighs into a straddle. Exhale and squeeze your thighs back together and contract your pelvic floor. Repeat 15 reps.