Does this thing really work?If so, do you have any suggestions for a program/schedule?Besides, this or pushups?
My gym has one of these fuckers,I keep sliding off of it.I'm not sure if it's really hard or just really retarded.
Fucking stupid- plank, crunches, etc. I have one.
I don't know about that one, but this one is an ab killer machine, you need to build a strong lower back to use it righthttp://www.youtube.com/watch?v=YmPxIUt7AEw