Do Crunches to get six pack abs:

Spread a mat on the floor and lie over it with arms in front of your chest and bend your knees. Raise your upper body towards your knees. Don’t lift your entire back, as it may cause strain on your back. Don’t let your head touch the ground and repeat this. Initially a person can start with 3 sets of 20 crunches and later can improve it.

You can also try these exercise to loose belly fat and this ab workouts to get abs fast at home.