Get an a$$ like a rockstar

Let's set the stage ... you've been training for quite some time, you managed to shed a good amount of fat and have even put on some lean muscle, and you're seeing glimpses of what may actually be the start of a six-pack. But, for whatever reason, your butt is still looking more George Lopez than Jennifer Lopez. What do you do?

While it is almost impossible to spot reduce fat from your body, it is very possible to target specific muscle groups. And though I usually suggest treating the body as a whole rather than a collection of individual parts, the fact remains that sometimes certain muscle groups lag behind a bit. With specific regard to your butt -- also known as your glutes -- there are certain exercises you can perform to help shape your booty. Here are just a few of them:

Stiff-Legged Deadlifts. Maintain only a slight bend in your knees and keep your back straight. Slowly lower the weight (barbell or dumbbells) in front of you. Once at the bottom, slowly return to the upright position, squeezing your glutes as you do.

Hyperextensions. This exercise is typically considered a lower-back exercise, but it also targets the hamstrings and glutes. More or less, the movement mimics the stiff-legged deadlift, only it involves keeping your legs held straight by a fastening device or weight of some kind, and your upper body swinging freely off the edge. Since that was just about the worst description I could have possibly written, my advice would be to click here for a video demonstration.

Lunges. Holding either a set of dumbbells in your hands or a barbell across your upper back/shoulders (or use only your body weight if you are a beginner), start with both feet together. Next, take an exaggerated step forward and then slowly lower your body until the knee of the foot you did not step with is inches from touching the floor. Then, slowly reverse the movement and step backward. Reverse feet and complete this movement once again. This constitutes one rep. Try to perform a set of at least 10-15 total reps.