I think most women lose weight from the breast area first, but if you want to keep your cleavage, try alternating between crunches and push ups. Not only will the push ups help tone up your arms, but they strengthen your chest and entire core muscles--including your stomach. Remember to exercise properly. In exercise quality is best, not quantity! Keep your spine in a straight line from your head to your toes(or knees), keeping your ab muscles engaged. Start off slow if you have to, but you will see less sag from the ladies and a more taught mid section if you stick to it!