best ab workout?

[gettingfitmom]

Cathe. In your opinion, what is the most effective ab workout? Also, what can I do in place of routines like the ball exchange or other routines that invlove the arms and legs at the same time. These tend to really pull on my lower back. Thanks, Gettingfitmom

 

[amybajamy]

Not Cathe, but have you tried the ball exchange with your knees bent? That's how I have to do them and as I've been doing them more I'm able to have my knees bent less.

 

[gettingfitmom]

Amy, I've tried that too, but it still pulls on my back. It arches off the ground. Thanks for the input Gettingfitmom