This is a tricky question. If it is the skin that is sagging then you’re going to need to use a treatment cream/lotion that contains growth factors, such as Skin Medica’s TNS Body Lotion. You will however not get quick results this way, you would really need to consider doing treatments as well, such as laser genesis or carboxy therapy. If however, it is the muscle that is starting to sag, you’re going to need some muscle toning therapy or exercises. You may want to consider getting a medical aesthetic doctor or therapist to have a look and give you the best advice.