3 Flat-Ab Exercises From Shaun T — and All You Need Is a Chair

• Sit on the edge of a chair and bring your hands behind your head, opening your elbows as wide as you can; this will work your upper back to help improve your posture.
• Lift your heels off the floor and feel your abs engage. Keeping your spine straight, lean back to lift your knees. Hold this position for a moment and feel the core connection increasing.
• Lean forward and lower your knees with control, bringing toes to floor. Then lower heels. This completes one rep.
• Do this exercise for one minute.

Shaun's note: Keep this movement slow and controlled.