Find out how their trainers, David Kirsch and Anna Kaiser, are helping them get in their best shape before the show.
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If Jennifer Lopez and Shakira are going to perform in the Super Bowl, you know it's about to be an insane show. With Super Bowl LIV just a few days away, both performers are going all-in on their preparation. The game's iconic halftime show musical performance, which has featured artists like Beyoncé and Lady Gaga in the past, is typically about 15 minutes long. Performers not only sing live that entire time, but they also run through incredibly energetic, choreographed dance routines—with a casual audience of nearly 100 million viewers. To say the least, the gig requires a lot of prep.

J. Lo has been rehearsing since September, fiancé Alex Rodriguez told Today. She's been working with celebrity trainer David Kirsch, director of fitness at the Core Club in New York, according to The New York Post.

"There’s no quit in Jennifer, she's hardcore," Kirsch told The Post. "She was very hyper-focused and very disciplined. At 50, she has better muscle tone than some of my clients who are 25.”

In terms of diet, it seems like J. Lo has steered clear of anything too crazy, like that 10-day, no-sugar, no-carbs challenge she did with A-Rod last year. Instead, she's been sticking to the basics, Kirsch told The Post. "She keeps her diet very clean," he explained. Specifically, J. Lo focuses on staying hydrated and mixing lean protein with veggies (a nutritious combo that can help speed up recovery, maximize exercise benefits, and help maintain lean muscle), shared the trainer.

As for her workouts, Kirsch told The Post there's no one who kills the push-up game quite like J. Lo. (Psst, here's how to do a push-up correctly.)

Per her Instagram Story last week, it seems that J. Lo has also been slaying some serious butt workouts ahead of the Super Bowl. In a video she reposted from A-Rod's Instagram Story, Lopez is seen doing seated leg extensions, a weight-training workout that can help target the quads. (FYI, though: Some trainers believe there's no functional benefit to leg extensions since the kicking motion isn't really a natural movement for the body—here's what to try instead).

J. Lo then moved on to Romanian deadlifts, one of the best glutes-shaping exercises out there (it's also great for your lower back, hamstrings, and core engagement). After that, Lopez crushed some butterfly hip thrusts, another, gentler way to train your glutes.

Shakira is likewise working hard to train for Super Bowl LIV. Her trainer, Anna Kaiser gave Shape the details on her current fitness routine. (Related: The Quick 12-Minute Abs Workout You Can Do Anywhere)

Kaiser, who's also worked with Karlie Kloss and Sarah Jessica Parker, has been training Shakira for 10 years (since her She Wolf video). To help the singer get ready for her Super Bowl performance, Kaiser says she's been taking Shakira through some of the workouts offered at her AKT studios, which are known for their focus on dance-based cardio. Kaiser says she's mainly incorporating two of her four signature workouts: "Dance", which alternates between choreographed dance sections and strength intervals, and "Tone", which Kaiser describes as "45 minutes of muscular endurance burnout" or "barre meets Pilates meets core conditioning." (BTW, here's why core strength is so important.)

Shakira's schedule varies, but she'll typically fit in 4–5 workouts per week, explains Kaiser. On top of those workouts, Shakira often has dance rehearsals which are obviously exhausting workouts in themselves, adds the trainer. (Related: Strengthen Your Core with This Viral Dance Move Workout)

In a recent workout video she shared on Instagram, Shakira gave fans a glimpse into what some of these workouts actually look like. One clip shows the singer doing basic squats while holding on to what appears to be a resistance band with both arms. ICYDK, squats work several major muscle groups in the body (as long as you're doing them correctly), including your quads, glutes, hamstrings, and core. They're also one of the five main foundational movements for daily life, according to the American Council On Exercise.

The next clip in Shakira's video shows the singer doing lying dumbbell pullovers (a solid way to strengthen the chest), followed by sliding triceps push-ups, a workout you can easily replicate at home to tone your arms, chest, and core.

In addition to her workouts, Kaiser says she has a hand in Shakira's diet. The trainer tells Shape she favors eating small meals throughout the day to keep energy levels up. "I work with Shakira's chef to create meals and snacks," she says. "It's all about real food, she doesn't like supplementing. She wants it to be really good, fresh food and no shortcuts." (Here's the expert take on eating small meals throughout the day.)

Shakira's also the type who likes to set new goals and focus on advancing toward them, Kaiser continues telling us. The trainer says she gave the singer an InBody machine, a body composition analyzer that provides measures like skeletal muscle mass and body fat percentage. She also uses a heart rate monitor while she's exercising. "Knowing if your body is changing, if you're getting results, and how hard you're working in class is super important," explains Kaiser. Shakira has a constant desire to become "her best, strongest, most confident self," she says. (Related: 5 Smart Scales That Tell You More About Your Body Than Just Your Weight)

As the big game draws closer, Kaiser says she plans on ramping up Shakira's training. "I will probably meet her at least one more time and do a sort of intensive preparation," she says. She can confirm that everyone's in for a hell of a show: "There's definitely going to be a performance."