While lifting heavy barbells is a surefire way to add muscle to your glutes, you can do it with dumbbells, too. Grab a pair that are medium- to heavy-weight (eight to 20 pounds, maybe more), and do these six moves that target your butt and legs. Repeat this workout two to three times. Your butt will be burning, promise. Once you get stronger, go ahead and increase the dumbbell weight.