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For the abs try doing 100 reps a day in sets of 15 or more.Knee tucks and leg
raises are also good.
Edit: You can also do combination exercises like lying leg raise and crunches.
Even triple ones the variations are endless.Isometic ones like raising
you legs and holding them up as long as you can.Combine this with a crunch makes this even harder.So situps work the upper abs,crunches the middle abs and leag raise/knee tucks the lower abs.There is also the hanging leg raise/knee tucks from a chin up bar.For lying leg raise you can also sway them to you sides.
Crunches can alternate with twisting from side to side.Don't forget the lower back
by doing arching back while lying on stomach. Good luck.