Exercise ball crunch

Exercise ball crunch: This exercise needs a lot of stabilization which engages more muscles. You'll need an exercise ball.
-Lie on the ball so your lower back is supported and feet are firmly planted on the ground
-Place hands across chest or behind the head
-Contract abs and lift your torso up and forwar
-Lower back down
-Keep the ball stable during each crunch
-Exhale when you crunch; inhale when you lower back down
-Do 1-3 sets with 12-16 repetitions