Stability Ball Crunch Pointers

When doing ab curls on a stability ball (the big ones full of air), make sure you extend back over the curve of the ball, and only come up to where your head is just barely above parallel with the ground.

I see so many people start with their torso parallel with to ground (or higher!) and wind up almost sitting up on the ball at the top of the movement This pretty much negates the advantage of having a ball. You'd get a more intense ab contraction if you did regular ab curls on the ground.

Also, keep in mind that the closer together the legs are, the harder the move is. So legs together from heel all the way to upper inner thigh is the most advanced method of doing stability ball crunches.

Additionally, as with any ab exercise, keep the abs tight and engaged throughout the movement. When you don't let momentum take over and instead actively use muscle all the way through, the exercise becomes both more challenging and more effective.