Crunches

The crunch or curl-up is an abdominal exercise that works the abdominials muscle. It enables both building and defining “six-pack” abs and tightening the belly

2:- PLANKS

The plank is an isometric core strength exercise that involves maintaining a position similar to a push-up. 

3:- russian twist

The Russian twist is a simple abdominal exercise for working the core, shoulders, and hips.

4:- Sit ups

The plank is an isometric core strength exercise that involves maintaining a position similar to a push-up. 

5:- Hollow Hold

Get your middle ab exercises right and you’ll be building a stronger core from the get-go