The quickest way is to eat less, reduce the amount of food by 40%, and then do 50 sit-ups every day. This is the standard sit-ups. Dieting is to reduce meat, and sit-ups are very useful for exercising waist muscles, otherwise even if you lose weight, it will be baggy and unsightly. . .

This is what I always insist on. My waist is very thin. . Looks a little ABS. . . But it may also be related to practicing jazz, hehe. .

I hope it works for you,