I haven't check out the shapefit workout but as long as your sticking to a few things you should make solid progress. 1) Health diet - low fat, high protein ; easily the most important part 2) Proper ab exercise - just sit ups and cardio won't get you near as far as specifically targeting different ...

Not too sure about the shapefit routine but getting abs are about a few things: 1) Healthy Diet - easily the most important (low fat, high protein) 2) Doing the proper exercises - just sit ups and cardio won't get you anywhere fast, mix it up and make sure some days you target upper abs, lower abs, ...