Remember cowards never start, the weak never finish.
1. 4 sets of 25 sit ups
These are classic sit ups but they do the job, Make sure you feel the burn and do them SLOW!
2. Leg outs hold for 10 seconds 4 sets of 12
These again must be done slow you'll feel more of a burn when done slower it's not about speed when it comes to muscle growth.
3. 3 sets of 10 Roman chair sit ups
These will help your abs all around not just the top but the lower as well, these will burn like HELL! But if you push through them you'll see great results.
4. 3 sets of 10 use a weight hold it out and squat down. This will build the core as well as legs.
5. 4 sets of 25 bike kicks. T
These will will build your abs as well as legs.
6. 3 sets of 10 Toe touches
Toe touches focus' on the lower abs and helps the abs to stretch and expand. It also ads a solid finish to your ab workout.
Mix it up and have fun, there's no definite workout routine that will get you shredded abs, but this will help you get you there.