[header] How to perform exercise ball abdominal crunches [title] Make sure to give your limbs enough space when placing the exercise ball down. [title] Lie down on the floor with your back on the floor and your legs propped up on the exercise ball at a right angle. [step] Get closer to the ball if you don't feel stable, or position the ball directly against a wall. 
[title] Place your hands behind your head (fingers unclasped) and tighten your abs to straighten out your spine (there should be no space between the curved part of your spine and the floor). [step] Inhale as you hold this neutral position.