You've already done Step Ups, but now it's time to do Lateral Step Ups, an exercise that focuses on rounding out your hips as well as your glutes. For that beautiful hourglass figure, this is definitely a movement you want to incorporate into your workout.
This one is going to make your hips ache. Your body likely isn't used to this type of motion, so don't be surprised if you've got achy hips. Start out with very little (or no) weight, and slowly add as you adjust to it.
Lateral Step Ups
Place two weight benches parallel to each other, roughly 3 feet apart. Stand between the two benches, and grip a dumbbell in each hand (or do it with just your bodyweight, according to your fitness level).
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Lift your right knee and place your right foot on the bench to your right, and push off with your back foot to step up onto the bench. Don't place that left foot down, but keep it in the air before you drop back down to the floor. Lift the left knee, place the left foot on the left bench, and step up.
Repeat as desired.