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J.Lo’s former trainer reveals the ‘best bang for your buck’ exercise for tight abs

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J.Lo’s former trainer reveals the ‘best bang for your buck’ exercise for tight abs

Jennifer Lopez is known as much for her sculpted physique as she is for her music, movie roles and romantic partners.

Her former trainer, Jay Cardiello, revealed to The Post how he helped J.Lo achieve her aspirational abs — plus the single exercise that gives you the “best bang for you buck” when it comes to your core.

Cardiello, who is also the in-house fitness advisor for the elevated wellness brand Kailo Nutrition, says consistency beats perfection when it comes to achieving a flat stomach.

J. Lo’s former trainer revealed how he helped the star achieve her aspirational abs. Instagram/jlo

“Understand that abs are built through behavior, not just crunches,” he said.

“You can’t out-train poor nutrition or chronic stress, so prioritize sustainable eating habits, quality sleep, stress management and core-focused functional movement. A flat stomach isn’t just about aesthetics — it’s about having a strong, stable core that supports your body,” Cardiello noted.

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Why is a strong core a priority? The core area, also known as the lumbo-pelvic-hip complex, stabilizes both the upper and lower body, thereby improving posture, enhancing mobility and preventing injury.

All about your eating habits

Cardiello advises clients who want a cut midsection to commit to regular exercise and fueling their bodies with whole foods.

“My number one rule is: Avoid overly processed foods, added sugars, and excessive sodium, as these contribute to inflammation, bloating and fat storage, especially around the midsection,” he said.

Cardiello urges the abdominally motivated to prioritize a diet of lean protein, fiber-rich vegetables, healthy fats and complex carbs to stabilize blood sugar and reduce cravings.

“I advise clients to eat smaller, balanced meals throughout the day, avoid late-night heavy eating and limit their alcohol intake, as this can disrupt digestion and metabolism,” he added.

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Jay Cardiello’s number one rule is to avoid overly processed foods, added sugars, and excessive sodium. Jennifer Lopez / Instagram

The ab-solute best exercise

In terms of carving out the core, Cardiello says that a simple plank hold is “hands down” (pun hopefully intended) your best bet for toning the abs.

“The plank is the most effective and simplest core-tightening exercise with the best bang for your buck,” he said. “It’s deceptively simple but incredibly powerful because it engages not just your abs, but your entire core, shoulders, glutes and even your posture muscles — all without needing any equipment.”

The plank pose builds isometric strength and stability, tightening the core muscles to create a flat, firm appearance. MZaitsev – stock.adobe.com

Cardiello notes that, in addition to being modifiable for any fitness level, the plank pose builds isometric strength and stability, tightening the core muscles to create a flat, firm appearance.

“Even holding a well-executed plank for 30-60 seconds daily will deliver noticeable improvements in core strength and overall tightness in a short amount of time. It’s efficient, low-risk and highly effective,” he said.

The plank has fans

Other experts echo Cardiello’s stance.

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Harvard Health Publishing maintains that planks are more effective than sit-ups, saying the former “recruit a better balance of muscles on the front, sides and back of the body than sit-ups, which target just a few muscles.”

“Plank exercises help strengthen the entire set of core muscles you use every day, leaving you with a stronger and more balanced body,” they added.

Jay Cardiello emphasizes that a consistent approach to health is more beneficial than any single element or exercise. Jay Cardiello

Other must-dos for a fit figure

In addition to a balanced diet and consistent exercise, including solid plank work, Cardiello recommends healthy lifestyle habits such as stress management and high-quality sleep.

He said that everyone aim for seven to nine hours of shut-eye per night to help the body maintain muscle.

“Poor sleep elevates cortisol levels, which encourages fat storage, especially around the midsection,” he said. “It’s one of the most overlooked factors, yet it has a huge impact on both metabolism and recovery.”

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He notes that chronic stress keeps the body locked in a cortisol-spiking “fight or flight” mode that can lead to emotional eating and compromised digestion. “I recommend integrating breathwork, meditation or even just daily walks to bring stress levels down.”

A little supplementation

While he acknowledges that there’s no “magic pill” in terms of supplements, he takes magnesium glycinate to aid in relaxation and promote sleep quality, omega-3 fatty acids to reduce inflammation, which can contribute to belly fat retention, and a probiotic to support gut health as “digestion and bloating can directly affect how flat your stomach appears.”

But he stresses that a consistent approach to health is more beneficial than any single element or exercise.

“The real key is consistency — small, sustainable habits repeated daily will get you much further than any quick fix.

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Jennifer Aniston “doesn’t always want to work out” but her fitness app’s new four-week mindset and movement challenge makes exercise fun not punishing

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Jennifer Aniston “doesn’t always want to work out” but her fitness app’s new four-week mindset and movement challenge makes exercise fun not punishing

Actress Jennifer Aniston has launched a new four-week challenge with fitness app Pvolve to help people get into the right mindset to exercise.

The Worth It Everytime campaign, created in collaboration with mental wellness app Headspace, encourages people to view exercise as something that energizes them rather than punishes them.

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A trainer says returning to exercise in your 40s and 50s should look different to what you did in your 20s—here’s how to get started again

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A trainer says returning to exercise in your 40s and 50s should look different to what you did in your 20s—here’s how to get started again

After a period of inactivity, getting your fitness back can feel like a tough slog.

Jason Smith, a personal trainer, nutritional advisor and founder of Fit in Midlife, knows this from personal experience. He got fit again at 50 after years of inactivity, then started training people of a similar age, helping them to do the same.

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Enter 2026 stronger than ever with these expert-approved fitness tips

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Enter 2026 stronger than ever with these expert-approved fitness tips
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Whether you’re focused on building muscle, improving your balance or working on your ability to complete longer, sustained workouts, one thing’s for sure: you’ll need to take small, actionable steps to reach your fitness goals.

Remember, you don’t need to drastically overhaul your life on January 1. In fact, before making any major changes to your dietary pattern and exercise routine, it’s best to have a conversation with your doctor first, especially if you live with any chronic conditions. In the long run, you’ll most benefit from taking small, actionable steps to help achieve your fitness and nutrition goals, the experts say.

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We asked fitness experts to break down their top tips to help you kick off 2026 stronger than ever.

How to fit exercise into a busy schedule

If you’re hitting the reset button on your fitness routine, start small and choose an exercise you enjoy, says Dr. Kimberly Burbank, a primary care sports medicine fellow and team physician at UCLA Athletics. You don’t necessarily need to do the movements traditionally associated with exercise to get a good workout in, either. “I really encourage people to choose (a movement) they actually enjoy doing, because they will probably stick with it more,” she says.

To help set attainable fitness goals, one route is to use the SMART framework of goal setting, recommends Dr. Brandee L. Waite, a professor and vice chair of Wellness & Community Engagement Department of Physical Medicine & Rehabilitation at UC Davis School of Medicine, the medical director of the UC Davis Health Sports Medicine Clinic and the director of Lifestyle & Longevity Medicine Innovation.

The SMART acronym stands for goals that are specific, measurable, attainable, realistic and time bound, and what’s great about using this framework in an exercise context is that you’re able to approach fitness as you would any other appointment — if it’s scheduled on your calendar, there’s a greater likelihood you’ll honor it, Waite says.

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When it comes to fitting exercise into a busy schedule, “I try to encourage consistency over perfection,” Burbank says. Often, her patients will express frustration that they’ve missed a week of exercise — and therefore their entire workout schedule has been thrown off. While it’s important to “be as consistent as you can, (understand) that you don’t have to be perfect to still make a meaningful difference,” she says.

If you’re someone who prefers to exercise in the morning, try to make it easy for yourself when you wake up. “It’s so easy when that alarm goes off to just ignore it and move on. But if you have laid out your clothes the night before, have your coffee prepped (and) have your bag packed, then there’s so many (fewer) variables and barriers,” Burbank says.

How often should you exercise?

There’s no perfect cadence as to how often you should exercise. “What works really well for one person, will not work at all for another person. So, it does need to be personalized and realistic,” says Waite. However, there is something to be said about shorter, more frequent workouts. There’s a lower risk of injury, and they’re faster to complete and generally easier to stay consistent with, Burbank says.

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Ultimately, what’s most important is to meet a certain number of goal minutes every week, says Dr. Julia L. Iafrate, a sports medicine physician at NYU Langone Health and a team physician for the U.S. Ski Team. The Physical Activity Guidelines for Americans and the American College of Sports Medicine recommend adults participate in 150-to-300 minutes of moderate-intensity exercise a week. While this might sound intimidating, that breaks down to only 30 minutes of exercise a day over the course of five days, and could consist of a mix of pilates, yoga or brisk walking.

If you prefer vigorous-intensity aerobic exercises (like HIIT or running), it’s recommended you complete at least 75 minutes a week, which evens out to a little more than 20 minutes of exercise a day over the course of three days. On top of these exercises, the organizations suggest adults should partake in muscle-strengthening workouts at least two days a week.

What are the most beginner-friendly exercises?

There are a few forms of exercise that should be a central focus of your workouts: cardio, muscle strengthening and balance work. Practicing each type of exercise can help improve your ability to do the others and also reduce your risk of injury, Iafrate says.

  • Cardio. Incorporating aerobic exercises that get your heart rate up (such as running, swimming or cycling) is key to improving endurance, supports heart and lung health, and lowers your risk for a number of chronic diseases, Iafrate says. 
  • Muscle strengthening. Resistance training with weights stimulates two types of muscle contractions: eccentric loading and concentric loading. When you perform a bicep curl with a dumbbell in hand, that’s considered a concentric motion. As you lower the dumbbell and your arm straightens, that is an eccentric motion, Iafrate says. Both movements are important for strength building, tendon health and bone mineral density, she explains. 
  • Balance work. Functional movement training, including tai chi and yoga, is especially beneficial for maintaining flexibility, stabilizing your body and limiting the likelihood of falls down the line, Iafrate says. 
  • Weight-bearing exercise. “Walking, especially for beginners, is super underrated,” Burbank says. Getting your step count up to 7,000 steps a day offers immense benefits for health, including lowering your risk for cardiovascular diseases and type 2 diabetes, according to a 2025 study published in Lancet Public Health.

If you’re relatively new to exercise and don’t know what is helpful or harmful, Waite recommends having at least two-to-three sessions with a physical therapist to develop the right type of exercise program. For instance, if someone has a medical condition like hip arthritis, a professional can provide “modifications for a regular fitness training program that won’t further exacerbate the problem that is currently bothering them,” Waite says.

How can nutrition support fitness goals? 

“Nutrition and exercise have such a symbiotic relationship,” Burbank says. Throughout your week, prioritize whole, fiber-rich foods, including fruits, vegetables and whole grains. Americans aren’t consuming nearly enough protein, which is essential to muscle building, muscle recovery and satiety, Burbank notes. Your minimum daily intake of protein should hover between 0.8 grams to 1.2 grams of protein per kilogram of body weight. To increase your protein intake, the Dietary Guidelines for Americans 2020-2025 recommends incorporating more lean meats, poultry, eggs, seafood, legumes, nuts, seeds and soy into your diet.

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Hydration is particularly important, especially prior to working out. “When you’re dehydrated, (it will) increase your likelihood for fatigue and poor peak performance,” Iafrate says. Ideally, we should be drinking between 2.5 to 3 liters of water a day, Burbank says. 

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