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You’re not burning as many calories as you think you are with exercise — here’s why

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You’re not burning as many calories as you think you are with exercise — here’s why

Burn more, weigh less. Sounds simple, right? Not exactly.

A new study is challenging conventional wisdom about exercise and weight loss, suggesting your workout may not burn as many calories as you think.

The findings could help explain why so many people don’t see the scale budge, even when they’re regularly hitting the gym and watching what they eat.

New research hints that what you eat could have a bigger impact on calorie burn than exercise. highwaystarz – stock.adobe.com

It all comes down to math.

Over the course of a day, your body’s natural calorie burn without any formal exercise can range from about 1,300 to more than 2,000, depending on age, sex and other factors, according to the Cleveland Clinic.

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For years, scientists assumed any extra calories you burned — like from running a mile or swimming laps — would simply add to that total and lead to weight loss.

But recently, some researchers have been questioning that “additive model,” suggesting the body may follow a “constrained” approach instead.

That theory says your body has a built-in energy cap. So when you burn more calories during exercise, your body makes up for it by saving calories elsewhere — like cutting back on cellular repairs and other internal tasks.

Intrigued, two Duke University researchers decided to put the models head-to-head.

The study found the body often makes up for calories burned during cardio by quietly shutting down other processes. Svitlana – stock.adobe.com

They reviewed 14 exercise studies involving 450 people, along with several animal trials, and compared the calories subjects were expected to burn with the calories they actually burned.

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On average, the researchers found that only 72% of the calories burned during exercise actually showed up in total daily burn — the other 28% was quietly offset elsewhere in the body.

From an evolutionary standpoint, it makes sense. Our ancestors had to trek for miles without exhausting their energy reserves, according to Herman Pontzer, lead author of the study and an evolutionary anthropologist.

He witnessed this firsthand in Tanzania, where he lived among the Hadza, one of the last hunter-gatherer communities on Earth. Every day they trek miles across the dry savannah, hunting game and foraging for food.

Pontzer expected them to burn far more calories than notoriously sedentary Americans, but he found they actually burned about the same amount.

Our flexible metabolism — which lets us adapt to different diets and store fat for hard times — helped humans survive and thrive, and even shaped the way we age, Pontzer explained in an interview with Duke’s Magnify Magazine.

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Strength training didn’t trigger the same compensation effect as cardio did. FranciscoJavier – stock.adobe.com

Notably, however, this compensation effect wasn’t universal across all workouts.

The researchers found the body only seemed to compensate during aerobic exercise like running. When it came to lifting weights or resistance training, the three strength studies they reviewed showed people burned more calories than expected based on how much they exercised.

The team isn’t exactly sure why — but they have a few theories.

For one, it’s tough to measure calories burned while lifting. The methods used in the studies are likely better suited for steady cardio, so the numbers might be off.

It’s also possible that heavy lifting doesn’t trigger the same compensation response as long, sweaty aerobic sessions. And the act of repairing muscle damage after strength training may require extra energy as well.

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Diet also seemed to play a key role in how the body compensates.

The researchers found that if people cut calories while ramping up their workouts, their total burn often didn’t budge at all.

“The real killer here is that if you pair exercise with diet, your body goes, ‘Fine, well, then I’m going to compensate more,’” Pontzer told the New Scientist. “It’s still good for you, just not for weight loss.”

But that doesn’t mean you should cancel your gym membership.

Regular movement is still essential for our health — lowering chronic inflammation, stabilizing hormones and reducing the risk of chronic illnesses.

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“You have to think about diet and exercise as two different tools for two different jobs,” Pontzer said.

“Diet is the tool for managing your weight. Exercise is the tool for everything else related to health — from mental health to cardiometabolic disease.”

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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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