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Scientists say just 30 minutes of exercise a week could transform your health

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Scientists say just 30 minutes of exercise a week could transform your health

As summer approaches, many people try to get back into healthier exercise habits. Most of us already know physical activity is important, but sticking with a routine can still feel challenging, especially when time is limited.

Current health recommendations suggest exercising for at least 2.5 hours each week, with 5 hours considered even better. For many people, that target can seem overwhelming.

But research from the past two decades suggests the amount of exercise needed for meaningful health benefits may be much lower than many assume. According to researchers, just 30 minutes of high intensity exercise per week can improve health. That works out to roughly 4.5 minutes per day or about 10 minutes every other day. The important part is intensity. The activity needs to be strenuous enough to leave you noticeably out of breath.

If you use a heart rate monitor, researchers say your heart rate should reach about 85 percent of your maximum. However, special equipment is not necessary. A simple way to judge intensity is by how difficult it is to talk. You should still be able to speak in short sentences, but you should not be able to sing or carry on a continuous conversation comfortably.

Why Cardiovascular Fitness Matters

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“The biggest reported challenge regarding exercise is lack of time. But with intense, short workouts, this is no longer a valid excuse,” said Ulrik Wisløff, a professor at the Norwegian University of Science and Technology (NTNU) and head of CERG, a research group that conducts research on the health effects of exercise.

Researchers say even a small amount of high intensity activity can improve cardiovascular fitness, which plays a major role in long term health.

“Cardiovascular fitness is the best indicator of current and future health. Good cardio fitness reduces the risk of over 30 lifestyle diseases as well as premature death by 40 to 50 percent,” explained Wisløff.

CERG first documented these effects in a 2006 study that analyzed health information from 60,000 people. Since then, additional large studies from Norway and other countries have reported similar findings.

Is It Better To Spread Workouts Out?

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Would it be just as effective to do one intense 30 minute workout each week instead of several shorter sessions spread across multiple days?

“It is best to spread the sessions out a bit, because exercise also has an acute effect that lasts for one to two days, so that way you get the best of both worlds,” said Wisløff.

Researchers say blood pressure and blood sugar control improve for 24-48 hours after a workout that pushes you hard enough to become breathless for several minutes. Because of these short term benefits, experts recommend dividing exercise across two to four days per week whenever possible.

Short Interval Training Can Be Effective

That does not necessarily mean sprinting at full speed or using the highest resistance setting on an exercise bike.

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“No. Your own personal fitness level determines what gives you a high heart rate. If you are not very fit, simply taking a brisk walk may be enough. Having said that, you need to walk fast enough that you get quite out of breath. You can then increase the intensity as your fitness improves. Short intervals are effective. For example, this could be bursts of 45 seconds with 15-second breaks. Or like in Tabata workouts, with intense 20 second intervals interspersed with 10 second breaks. Otherwise, 4×4 intervals are recognized as highly effective for increasing oxygen uptake,” Wisløff said.

Fitness Must Be Maintained

Can you compensate for skipping exercise this week by doing extra workouts the week before?

“No. Fitness is something you have to maintain. Cardio fitness and strength decline quickly when not maintained, especially as you get older,” said Atefe R. Tari, a researcher and head of CERG’s initiative on exercise and brain health.

Strength training is also considered important, particularly for middle aged and older adults.

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“We know that strength training is important, especially for middle-aged and older adults. There is limited research on how strength training affects lifespan, but a HUNT study exploring this is due to be published soon,” said Wisløff.

The Trøndelag Health Study (The HUNT Study) is a long running population health study in Norway that has gathered health data for more than 40 years.

New AQ Measurement Tracks Exercise Intensity

Researchers have also introduced a new measurement system called AQ (Activity Quotient).

Unlike traditional activity tracking methods that focus mainly on steps or workout duration, AQ measures exercise intensity by monitoring heart rate. Researchers say this provides a more accurate picture of whether someone is active enough to improve health.

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Scientists at NTNU and CERG developed the AQ algorithm using population data from five countries, including Norway.

AQ can be measured through the Mia Health app created by NTNU and Sintef through the spin-off company Mia Health. The app connects with heart rate monitors, although users can also manually enter activities if they are not wearing one.

How AQ Points Work

AQ points are earned whenever physical activity raises your heart rate enough to make you slightly out of breath. The harder your heart works, the faster AQ points accumulate.

Researchers found that people reaching at least 25 AQ points per week significantly lowered their risk of lifestyle related diseases. According to the researchers, the strongest health benefits appeared at 100 AQ points or higher.

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Click here to read more about AQ.

In a study examining the relationship between AQ and health, researchers analyzed data from more than half a million people. The study found a strong connection between higher AQ scores, better cardiovascular fitness, and improved health outcomes:

Association between Activity Quotient and cause-specific mortality — A prospective cohort study of 0.5 million participants in Asia, Progress in Cardiovascular Diseases, March-April 2025

Exercise and Brain Health

Large studies also suggest exercise benefits the brain in addition to the body.

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“Physical health and brain health are closely linked, and cardio fitness is key here as well. Exercise leads to the formation of new brain cells,” said Atefe R. Tari, who is head of a research group at CERG.

Tari helped lead a scientific study on exercise and brain health published last year. The paper became one of the most widely read articles in The Lancet in 2025.

Researchers Push for “Micro Workouts”

Wisløff and Tari are now encouraging Norwegian health authorities to revise the country’s official exercise recommendations, arguing that exercise intensity should receive greater emphasis.

The researchers also wrote the book ‘Mikrotrening’ (in Norwegian), which draws on research reviews showing that brief bursts of high intensity activity may provide greater health benefits than spending many hours each week doing low to moderate intensity exercise. (Captions)

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“We need a new Dagfinn Høybråten to get the whole population on board with this,” said Wisløff, referring to the man who was the driver behind the introduction of the smoking ban in Norway.

“In my opinion, Høybråten is the politician who has done the most for public health in Norway since the Second World War,” said Wisløff.

“It usually takes 3 to 5 years to see the effects of implemented measures, and since we have general elections every four years, this is not easy to achieve. This should be a cross-party initiative because it would save Norway 2 to 4 health budgets per year, and could be used for prevention and in areas such as elderly care,” Wisløff said.

Researchers say Norway’s extensive long term health databases make it easier to evaluate how exercise policies affect public health over time.

“Norway could become a pioneer with regard to health benefits from micro workouts,” said Wisløff.

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Social Fitness: Why Independent Living Communities Are Vital for Healthy Aging

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Social Fitness: Why Independent Living Communities Are Vital for Healthy Aging
Retirement looks different for everyone. Some older adults want to stay in the homes they’ve known for decades, while others begin to wonder whether a different kind of living arrangement could offer more ease, support and connection. For Audrey Vasoll, 94, moving to The Sinclair at Port Washington,
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Alexandra Daddario, 40, relies on this underrated crunch upgrade for strong abs – here’s how to do it properly

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Alexandra Daddario, 40, relies on this underrated crunch upgrade for strong abs – here’s how to do it properly

From enduring some serious physical prep for Baywatch to working consistently with elite trainer Patrick Murphy, Alexanda Daddario’s dedication to fitness is well-documented. She often shares insights on social media, and in a recent Instagram post, the White Lotus star gave an insight into how she trains her core with one powerhouse movement: the reverse crunch into shoulder stand.

Why is it so good? Most traditional ab exercises require repetitive spinal flexion – the process of pulling your chest down toward your knees, like in a standard crunch. This isolates only the upper section of your abs, and for women who spend hours sitting at a desk, it can reinforce a slouched, rounded posture.

Instagram @alexandradaddario

Daddario’s movement flips the mechanics entirely since you actively curl your pelvis up toward your chest. In doing so, you target not only your upper abs, but the lower portion and your obliques (the sides) simultaneously, all while keeping your chest open and your neck unstrained. This translates into a much stronger core, better posture and crucial lower back protection. Research also shows that a controlled posterior tilt – the lower-body curl that initiates Daddario’s move – recruits a significantly higher percentage of deep core muscle fibres than traditional crunches.

alexandra daddario

@alexandradaddario//Instagram
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Daddario then drives her hips directly up into a vertical shoulder stand. This completely removes momentum from the equation (meaning you can’t “cheat”) and forces your abs – particularly your obliques – to balance your body and prevent you from tipping sideways.

She then takes it one step further into a Pilates plow position with her legs overhead, before reversing the movement and, again, using her abs to control the lowering of her entire lower body as she slowly unrolls her spine down onto the mat. The plow portion is optional (and super advanced); the slow, controlled, lowering phase, which happens whether you move into plow or not, is where the magic happens, challenging your core through both lifting and resisting gravity. Inspired? Here’s exactly how to do the move with good form, and how many reps and sets to aim for.

How to do a reverse crunch into shoulder stand

  1. Lie on your back (either on a mat, or on a reformer Pilates machine, like Daddario, with your arms anchored tightly to the floor.
  2. Engage your core to curl your knees toward your chest, then fluidly press your feet straight up toward the ceiling, lifting your hips and lower back off the floor.
  3. Slowly lower down, one vertebra at a time. Aim for 3 sets of 6-8 controlled reps.

Optional progression:

  1. As you reach shoulder stand with your legs extended to the ceiling, slowly start to lower your toes toward the floor over your head. Your weight should rest entirely on your shoulders and upper back – not your neck.
  2. Keeping your legs straight, use your core to extend them straight back up to the ceiling, then control the descent by rolling your spine down one vertebra at a time, with your legs remaining straight.

magazine cover featuring health and fitness theme

One of our most frequently asked questions here at Women’s Health? How to build muscle and burn fat at the same time. So, we asked superstar trainer Oyinda Okunowo exactly how to do it. In this 4-week plan – created exclusively for Women’s Health COLLECTIVE members – you’ll get the workouts and nutrition guidance needed to help you on your way to better body composition. Tap the link below to unlock 14 days of free access to Oyinda’s plan and start training today.

GET THE PLAN

Headshot of Bridie Wilkins

As Women’s Health UK’s fitness director and a qualified Pilates and yoga instructor, Bridie Wilkins has been passionately reporting on exercise, health and nutrition since the start of her decade-long career in journalism.

After earning a first-class degree in journalism and NCTJ accreditation, she secured her first role at Look Magazine, where she launched the magazine’s health and fitness column, Look Fit, before going on to become Health and Fitness writer at HELLO!

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Since, she has written for Stylist, Glamour, Cosmopolitan, Marie Claire, Elle, The Metro, Runner’s World and Red. Today, she oversees all fitness content across Women’s Health online and in print, spearheading leading cross-platform franchises, such as ‘Fit At Any Age’, which showcases the women proving that age is no barrier to exercise.

She has also represented the brand on BBC Radio London, plus various podcasts and Substacks – all with the aim to encourage more women to exercise and show them how. Outside of work, find her trying the latest Pilates studio, testing her VO2 max for fun (TY, Oura), or posting workouts on Instagram.   

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Built Strong: Fitness forges unbreakable father-son bond

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Fa­thers of­ten share spe­cial bonds with their chil­dren. For 80-year-old Chanka Ram­rat­tan, that bond is a shared love for fit­ness and ex­er­cise with his 46-year-old son Nari.

The Rousil­lac res­i­dent re­called that he be­gan ex­er­cis­ing at the age of 14, lift­ing weights and tak­ing long walks, a pas­sion that re­mains with him to­day. Dur­ing his time work­ing as a clerk at Tex­a­co, he said he would walk from For­est Re­serve to his Rousil­lac home, a dis­tance of ap­prox­i­mate­ly 12 kilo­me­tres.

“I have done every marathon in Trinidad; you name a marathon, I could tell you. Mi­a­mi Marathon, To­ba­go Sea-to-Sea, which is the most dif­fi­cult marathon that I’ve ever done. I even have a tro­phy where I got the fastest speed walk­ing man, and I have all my medals,” he re­count­ed.

Chanka’s last marathon was a vir­tu­al one in 2021. Since then, his doc­tor has ad­vised him to slow down be­cause of his age. Now, he spends his time at the Health and Fit­ness Gym in Debe and South Oropouche about three times a week, walk­ing marathons of his own on the tread­mill.

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“I do car­dio walk­ing for one hour, and I do weight train­ing for one hour. Then, I go in the sea and I swim and dive for one hour,” he not­ed.

Chanka firm­ly be­lieves reg­u­lar ex­er­cise has con­tributed to his longevi­ty and said he plans to keep go­ing.

“Ex­er­cise is very im­por­tant, and I like ex­er­cise. You go to Mi­a­mi, and you’ll see 90-year-olds and 100-year-olds in the gym, walk­ing, and even go­ing to marathons. That’s be­cause if you don’t ex­er­cise, you feel lethar­gic, you feel down. And you al­so have to read a lot. So, you ex­er­cise the brain, and you ex­er­cise the body,” Chanka ad­vised.

His son Nari be­lieves that per­se­ver­ance was one of the most im­por­tant lessons his fa­ther passed on to his chil­dren, along with a love of fit­ness and ex­er­cise.

“When you are look­ing at your dad, and your mom, and you are see­ing them ex­er­cis­ing and you are see­ing them fit, why would you not want to do the same thing? So, it was in­stilled in all of us, my­self and my two sib­lings. That ex­er­cis­ing be­came a rou­tine. My big­ger sis­ter, she would run, and my small­er sis­ter would do car­dio,” Nari ex­plained.

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The en­gi­neer and busi­ness­man re­called start­ing to ex­er­cise and lift weights with his fa­ther and un­cle from a young age, cred­it­ing the ex­pe­ri­ence with shap­ing the dis­ci­pline and fit­ness mind­set he still fol­lows to­day.

How­ev­er, in 2016, he faced a big ob­sta­cle af­ter he hit his head dur­ing a div­ing ac­ci­dent, dam­ag­ing his C6 and C7 ver­te­brae and spinal cord.

“I was 37 at the time when I got in­to the ac­ci­dent. I lost all feel­ing in my body. The per­son that you see in front of you now is not the per­son I was three years ago. I ac­tu­al­ly couldn’t move at all; I could on­ly move my toe. It took a lot of hard work and will, to come out of that sit­u­a­tion. Even­tu­al­ly, I start­ed to trans­fer from my wheel­chair to a bed, to a car. I even built a ma­chine for me to stand up with a har­ness, and it pulls me up in the air so I can stand up straight. So, I used that for two years to get my body back to where it is,” Nari ex­plained.

Nari, who is cur­rent­ly a quad­ri­pleg­ic, said he was on­ly able to make progress through per­sis­tence and sup­port from his loved ones. Chanka ad­mit­ted that pe­ri­od was one of the most dif­fi­cult ex­pe­ri­ences of his life as a par­ent.

“I wouldn’t like to ex­plain that, that is a dif­fer­ent thing al­to­geth­er. He was in Mount Hope for six months, we had to go every day. It was a re­al try­ing thing, but you know, he is on the way to re­cov­ery. His moth­er wants to see every­thing good for him. For me, she will treat me sec­ond class and she will treat them first class, and she is right. Be­cause the ones that are able to walk, you give them less at­ten­tion be­cause they are tend­ing to them­selves. You have to give more at­ten­tion to the one that needs at­ten­tion,” he ac­knowl­edged.

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But their bond through ex­er­cis­ing didn’t change. Dur­ing COVID-19, Nari said his fa­ther re­turned to weightlift­ing un­der his son’s guid­ance.

“When my dad was trapped in the house and he couldn’t go any­where, he was very mis­er­able. So, we had a sched­ule where he and I would use the weights that I have at home, and I would tell him what to do. He ac­tu­al­ly got a six-pack dur­ing COVID. So, we stayed home and ex­er­cised with my wife and all too. Af­ter, I re­alised now I could start back to go to gym,” Nari re­flect­ed.

Chanka said his son’s de­ter­mi­na­tion con­tin­ues to in­spire him.

“When you see some­body who is a bit in­ca­pac­i­tat­ed and they’re ex­er­cis­ing, they give you in­spi­ra­tion. Like if that man could do that, I could do that too. I wish Nari all the best. He is ad­her­ing to all his ex­er­cis­es, and he has a will that you won’t get in your next life. It’s prob­a­bly my genes passed on to him,” Chanka shared.

Nari said none of that would have been pos­si­ble with­out his fa­ther’s in­flu­ence.

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“Dad, I just want to tell you, thank you very much for be­ing in our lives. You give us the en­cour­age­ment to go day to day, and just keep be­ing who you are, be­cause you have a strong will, strong mind, and that is what keeps us go­ing every day,” he said.

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