Lie flat on the floor with your lower back pressed to the ground (pull down your abs to also target your deep abs). Put your hands behind your head. Bring in your knees toward your chest, and lift your shoulder blades off the ground. Straighten out
The flab that peep out when you wear a slim-fit shirt, T-shirt, sweaters, etc. is called love handles or muffin tops. These are one of the common reasons why people start exercising and also hire a personal trainer.