I have a question about workout equipment to tone your abs. I can't use anything that is hard on your back,and I have scarring from surgery that I also have to be mindful of...which means no crunches or sit ups. I was looking online and found these options.

https://www.thecontour.tv/PT_A6/?SID...ookieSupport=1

http://www.amazon.com/s/?ie=UTF8&key...l_60xpflhu34_e

I actually have tried an Ab Lounge before...and sometimes it does give me vertigo (I am prone to migraines). Just have not used one long enough to know if it was effective.

Has anyone tried one of these?