I do Sat, Sun, Mon, Wed, Fri: 150 with legs bent against the wall, 100 touching opposite elbow to opposite knee, 150 with legs up against the wall, like 90 deg., 150 more opposite elbow to opposite knee.
On Tue, Thu: 3 types of planks 3 times each for one minute, 50 knee bent situps holding dumbbells, 100 v-sits, 150 situps twice, once with one leg straight then the other.
Kinda hard to explain what I do, I just kinda made up that routine on my own and modify maybe once every couple months when I get bored. It got me rocking abs, and you probably could cut it in half and still get great results. On a side note, it also helped my form and times immensely.