A strong core and abs improves your posture. Good posture can make you look up to 10 pounds slimmer without dieting. Pretend there is a string running through your body. Pull the string out the top of your head stretching your body until you are standing tall. Tilt your chin upward, suck that gut in, throw your shoulders back and walk through your day with pride. Not only will you look slimmer you will look confident and approachable to others.