Do 4-5 more reps over the course of 1 minute.
Half boat: Sit tall on the floor with your knees bent. Extend your arms at chest level with your palms facing down. Lean back slightly, engaging your abs, and with both knees toward your chest while reaching forward with your arms. Hold this position with your feet off the floor for 10-20 seconds as you contract your abs. Lower your feet to the floor for 1 or 2 counts and repeat the exercise. Do 4 or 5 more reps over the course of 1 minute.