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You know you have to exercise to make you're butt smaller; it's not going to disappear while you sleep. Your dilemma is, what exercises should you do to make your butt smaller? The gluteus maximus is the largest muscle in your body, and the key to making it shrink is to make it work. There are certain things you can do to minimize your maximus faster, and before you know it your butt will be smaller and you'll have an excuse to go shopping for new jeans!