Jennifer Lopez’s Go-To Butt-Targeting Workout, Straight From Her Trainer

Like a fine (organic) wine, Jennifer Lopez seems to be getting better with age.

After nearly 20 years in the limelight (yep, Selena came out in 1997), you’d think that the singer, dancer and actress would be slowing down a bit—but you’d be wrong. This year alone, she released a new single and music video, starred in the TV show Shades of Blue, acted as a judge on American Idol and performed her show in Las Vegas in between. But how does the star—who just celebrated her 47th birthday in July—keep up her never-ending energetic star power?

She chalks it all up to a serious fitness regimen.

While she’s been known to regularly dabble in dance cardio with Tracy Anderson as her personal trainer-slash-choreographer, she’s also stuck to the classic—but hard-core—mix of cardio and body-weight training created by her longtime trainer David Kirsch to keep her figure in check (including a certain signature asset).

While she may not be taking up the new boxing trend (on Instagram at least) or trying out every buzzy new studio, she’s definitely not afraid to work up a serious sweat—and rack up the squat count—in the name of fitness.

Scroll down to see the J.Lo-approved derriere workout, straight from her personal trainer.

Photo: David Kirsch

Sumo Lunge to a Side Kick with Squat Jump 1. Stand in a “sumo” position with your feet slightly wider than shoulder-width apart, knees bent and body weight over your heels.

2. Take a large step sideways with your right leg, bringing your right knee in toward your chest and then over to the right in one continuous movement.

3. As soon as your right foot touches the ground, bring your knee back into your chest and complete a side kick, kicking your right heel out to the side.

4. Lower your right leg to the floor, returning to sumo position. Squat down while keeping weight in your heels and stick out your butt. Keep your knees directly above—not in front of—your toes.

5. Spring up while thrusting your arms overhead. Land on your heels, rolling forward onto your toes. Repeat with a sumo lunge and side kick with your left leg and another squat jump. Continue alternating right and left until you have completed 15 lunges on each side and 30 squat jumps.

Photo: David Kirsch

Reverse Crossover Lunge to Lateral Lunge

1. Stand with your feet shoulder-width apart. Step your right leg back and behind your left leg and lunge, almost as if curtsying.

2. Reverse to return to the starting position.

3. Step your right leg out to the side laterally, without pausing. Step into your right heel, keeping the right knee aligned with the heel. Your anchor leg should be in a 90-degree angle. Keep your hips, heels and knees forward and aligned. Repeat, but step your left leg back. That’s one rep. Perform 15 reps (or 15 lunges) on each side.

Photo: David Kirsch

Plié Toe Squats 1. Start with your feet wider than shoulder-width apart and turned out at 45-degree angles with your hands on your hips. As you squat down, simultaneously lift up your heels as high as you can.

2. Return to starting position—that’s one rep. Perform 15 reps. For the rest of the butt-busting workout, check out the full article on Well and Good.