Ab Compilation Focusing on Plank Work and or Standing Core

[ReenaPP]

Similar to ab hits, how about a compilation of previous dvds that focus on plank and/or standing core work with a bit of stability ball thrown in, which is easier for certain populations (back issues, pregnancy, etc.). Cathe already has a ton of material; the issue is getting it in one place :-) Could be a quick hit winner....I am pregnant now and pop in multiple dvds to get a good ab workout to avoid traditional crunches and lying flat on my back. Folks with back issues might enjoy performing a workout with minimal modifications (e.g., if crunches and full sit ups are not included)
Thanks!