Fitness
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
“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?
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.
“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.
“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.
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.
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.
“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)
“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.
Fitness
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Fitness
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.
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.
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
- Lie on your back (either on a mat, or on a reformer Pilates machine, like Daddario, with your arms anchored tightly to the floor.
- 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.
- Slowly lower down, one vertebra at a time. Aim for 3 sets of 6-8 controlled reps.
Optional progression:
- 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.
- 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.
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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!
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.
Fitness
Built Strong: Fitness forges unbreakable father-son bond
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.
“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.
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.
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.
“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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