Here are 3 exercises for your lower abdominal.
This will help tighten your lower belly.
2-3 sets per exercise.
Also, if you want a flat stomach,then you need a combination of:
* Healthy and less calories than you burn
* Abs exercises
If you only do ab exercises and still eat a lot, then you won’t see any abs.
You will have a stronger belly though,but to get it smaller, you need to lose fat as well.