Lie down on the floor on your back and bend your knees, placing your hands behind your head or across your chest.
Pull your belly button towards your spine, and flatten your lower back against the floor.
Slowly contract your abdominals, bringing your shoulder blades about one or two inches off the floor.
Exhale as you come up and keep your neck straight, chin up. Aiming to get your elbows to come closer to the tops of your legs. Slowly lower back down, but don't relax all the way. Breath out on the pulling phase and in on the return phase.
Perform one set of 8 - 12 Reps.
If you are used to doing this exercise try one set of 15 - 20 Reps. Add weight by holding a dumbell or weight plate firmly on your chest for extra resistance, if needed.
Posture : Abs tight