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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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Do you have sore hips? I asked a pain specialist why this happens and how to improve it

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Do you have sore hips? I asked a pain specialist why this happens and how to improve it

Hip soreness is a terribly common issue—it’s something that I certainly suffer with—so I’m always trying to get to the bottom of where this soreness originates from and what you can do about it.

According to Dr Shady Hassan, MD, an interventional pain and sports medicine physician and the founder of NefraHealth, immobility is the root cause of this discomfort.

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“No Pain No Gain” May Be Wrong: Science Says Slow Eccentric Exercise Builds Stronger Muscles

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“No Pain No Gain” May Be Wrong: Science Says Slow Eccentric Exercise Builds Stronger Muscles

Modern exercise culture has spent years glorifying exhaustion. The harder a workout feels, the more effective people assume it must be. Sore muscles became badges of honor, while gentle movements were often dismissed as ‘not real exercise.’ 

A man lifting a dumbbell. Image credits: Andres Ayrton/Pexels

However, according to a new study, some of the most efficient ways to build muscle strength may happen during the slow, controlled moments people usually ignore—walking downstairs, lowering weights, or carefully sitting into a chair. 

Study author Kazunori Nosaka, who is the director of exercise and sports science at Edith Cowan University, argues that eccentric exercise—a type of muscle action that occurs while muscles lengthen under tension, may offer a more practical alternative. Its opposite, concentric exercise, is the shortening (lifting) phase where muscles produce force to overcome resistance.

Instead of demanding maximum effort, these movements appear to train muscles while placing less stress on the body.  

“The idea that exercise must be exhausting or painful is holding people back. Instead, we should be focusing on eccentric exercises which can deliver stronger results with far less effort than traditional exercise – and you don’t even need a gym,” Nosaka said.

Muscles work differently on the way down

The study examines decades of earlier research on eccentric exercise rather than presenting a single laboratory experiment. It focuses on a simple but often overlooked detail of human movement, which is how muscles behave differently depending on whether they are shortening or lengthening.

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When someone lifts a dumbbell, climbs stairs, or rises from a chair, muscles shorten as they generate force. Scientists call this a concentric contraction. Eccentric contractions happen during the opposite phase—when the muscle stays active while stretching. 

Examples include lowering the dumbbell back down, descending stairs, or slowly lowering the body into a seated position. According to the review, muscles can tolerate and produce greater force during eccentric actions while using comparatively less energy and oxygen. 

“Eccentric contractions are distinguished by their ability to generate greater force than concentric or isometric contractions, while requiring less metabolic cost,” Nosaka notes.

Researchers believe this happens because muscles act more like controlled braking systems during lengthening movements, resisting gravity rather than directly overpowering it. As a result, people may gain strength without putting the same level of demand on the cardiovascular system. 

This difference could make eccentric exercise especially useful for individuals who find traditional workouts physically overwhelming.

“Eccentric exercise training provides numerous benefits for physical fitness and overall health, making it suitable for a wide range of individuals from children to older adults, clinical populations to athletes, and sedentary to highly active people,” Nosaka added.

Gravity may be doing more training than we realized

To support this argument, the study brings together findings from several earlier research works. For instance, one study from 2017 tracked elderly women with obesity who repeatedly walked either upstairs or downstairs over a 12-week period. 

While climbing stairs is normally considered the tougher workout, the women assigned to walk downstairs showed stronger improvements in measures including blood pressure, heart rate, and physical fitness. The results suggested that resisting gravity during downward movement may provide a surprisingly powerful training effect.

YouTube videoYouTube video

The review also discusses eccentric cycling, where participants resist pedals driven backward by a motor instead of pushing them forward in the usual way. 

Although the movement feels unusual and requires concentration, earlier studies found it improved muscle power, balance, and cardiovascular health while feeling less exhausting than standard cycling workouts.

Another important part of the review addresses muscle soreness, one of the main reasons eccentric exercise never became widely popular outside rehabilitation settings. People often experience delayed onset muscle soreness, or DOMS, after unfamiliar eccentric workouts. 

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“Unaccustomed eccentric exercise is often associated with muscle damage characterized by delayed onset muscle soreness (DOMS) and a reduction in muscle force-generating capacity lasting more than a day. However, this effect diminishes or at least is attenuated when the same eccentric exercise is repeated (known as the repeated bout effect),” Nosaka explained

Many eccentric exercises require little or no equipment. Slow squats into a chair, heel-lowering movements, controlled wall push-ups, or even maintaining posture against gravity can activate eccentric muscle work. 

Moreover, some studies referenced in Nosaka’s review suggest that just a few minutes of these exercises each day can still produce measurable improvements in health and strength.

The future of fitness may feel less punishing

The findings challenge the mindset surrounding fitness itself. Many people abandon exercise routines because they associate physical activity with pain, fatigue, or lack of time. Eccentric exercise suggests that effective movement does not always need to feel extreme. 

If future research continues to support these findings, eccentric exercise could influence far more than gym routines. It may reshape physical rehabilitation, elderly care, injury recovery programs, and public-health recommendations aimed at increasing physical activity among sedentary populations. 

These exercises also place lower demands on the heart and lungs while still strengthening muscles. They could help people who are unable or unwilling to follow intense training programs.

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Nosaka suggests that “we should establish eccentric exercise as standard practice, and make it common, accessible, and widely accepted as the ‘new normal’ of exercise to improve life performance and high (athletic) performance.”

However, this does not mean eccentric exercise is a universal replacement for all forms of physical activity. The current paper is a review of previous studies, and its findings still need to be validated through experiments and large-scale clinical trials.

Nosaka also notes that “Future studies should investigate mechanisms underpinning the effects of eccentric exercises in comparison to other types of exercises (e.g., isometric exercises, concentric exercises, aerobic exercises),”  

This could help scientists design safer and more personalized exercise programs for different age groups and health conditions.

The study is published in the Journal of Sport and Health Science.

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Flexibility expert recommends doing this for three minutes daily to improve mobility

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Flexibility expert recommends doing this for three minutes daily to improve mobility

Longevity is something of a buzzword right now, and the idea of living better for longer is undoubtedly appealing. Mobility is a key component of this.

By definition, mobility is the ability to move freely, something that tends to deteriorate as we age. But there are simple things we can do to maintain it.

One of them is “joint flossing”, a daily practice recommended by experienced coach and mobility specialist Darren Ellis.

“Mobility is a conflation of strength and flexibility,” he says. “I always used to believe that strength was the foundation of everything in exercise. But if you’re strong and you can’t move through a decent range of motion at certain joints, you’re still suffering.

“When you reach down to pick something up from the floor and it seems further away than it used to be, you suddenly realise how crucial mobility is.”

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Below, Ellis explains how to use his three-minute joint flossing protocol to help ease stiff joints and improve your ability to move.

How to try joint flossing

The body works on a rough “use it or lose it” basis. If you rarely move a joint through its full range of motion, the tissues around it can become tight, stiff and sore. The natural remedy for this is gradually reintroducing movement in the affected areas.

“The easiest place to start when improving mobility is to get the joints moving more freely with some simple joint circles,” says Ellis. “I sometimes call it joint flossing because, firstly, you are flossing nutrients through the joint by promoting blood flow in this area, and secondly, it’s something you should do regularly.”

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You start with neck circles then work your way down your body from your head to your toes, as shown in the video above – if something can move, you move it.

Ellis recommends doing five to 10 repetitions per body part, using a controlled tempo and a range of motion that feels safe and comfortable for you.

“There’s no need to force anything,” he says. “You’re just giving your body a chance to move again.”

Doing this consistently will improve your physical capacity and mobility, allowing you to return to other movements and exercises over time.

Read more: Five stretches you should be doing every day, according to a flexibility expert

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