A sexy, round booty makes for a great rear view as you strut your stuff in tight jeans or a curve-hugging skirt. As you workout to build bigger butt muscles, strength training exercise machines can help you reach your goal. Additionally, using cardio exercise machines to lose the extra jiggle in your wiggle will help you reveal those sculpted muscles as you develop them. Butt Muscles Whether it's tight and toned, or flabby and droopy, your butt contains three muscles -- the gluteus minimus, gluteus medius and gluteus maximus. The gluteus maximus makes up the bulk of your rear, while the medius is located up toward your hip and the minimus is tucked in between the two. While up to 70 percent of your butt's shape can be attributed to genes, the remaining 30 percent relies on the amount of exercise you do, your nutrition, posture and the amount of sleep you get. Strengthening your glute muscles with weight machines and losing excess fat from all over your body with cardio ma