Fitness
Why exercise is as good for your brain as it is for your body

A satisfying night’s sleep has long been branded as the cure to all ills, particularly when clearing damaging toxins from the brain.
Neuroscientists have long believed that deep sleep helps the clearance of problematic debris from the brain, flushing away many of the proteins and metabolites thought to be involved in the development of Alzheimer’s and other dementias.
This is hardly reassuring for the insomniacs amongst us. However definitive proof has always been hard to come by, and a new study in the journal Nature Neuroscience has poured cold water on the theory. While sleep is still vital for many aspects of health, Bill Wisden, a professor at the UK Dementia Research Institute who was involved in leading the study, says that being active may actually play a far bigger role in toxin clearance.
“We have shown that brain clearance is highly efficient during the waking state,” he says. “In general, being awake, active, and exercising may more efficiently clean the brain of toxins.”
This is undoubtedly good news for anyone who struggles to get a solid seven hours a night. After all, a brisk half-hour walk is something most of us can manage even after a night of tossing and turning.
Wisden’s suggestion fits in with a growing number of research breakthroughs in recent years that indicate the sheer importance of exercise for all aspects of the brain.
Toxin clearance
Exercise’s role in removing waste from the brain is currently an area of active investigation in research labs across the globe. The working theory relates to certain shape-shifting brain cells known as microglial cells which can take on different personas depending on your state of health.
In some psychiatric conditions such as schizophrenia and even Long Covid, the disease process causes microglia to take on a visibly spiky form, generating inflammation and interfering with the brain’s natural workings.
However, researchers suspect that exercise may actively induce microglia to take on a healthier anti-inflammatory guise. This means they would act as helpful scavengers, clearing detritus and ensuring that the synaptic connections between neurons are clean and functioning properly.
“Microglia are there to survey everything,” says Dr Rebecca MacPherson, associate professor at Brock University in Canada where she runs a lab studying how exercise benefits the brain. “We’re exploring this idea that exercise activates them in a way that enhances the way they clear the products of metabolism.”
The brain fertiliser
Research has repeatedly shown that being physically active reduces the risk of all forms of dementia by 28%, and Alzheimer’s disease in particular by 45%.
Over the years scientists have conducted various experiments in which participants have been randomised into two different groups, with one group following an exercise program and the other remaining sedentary. Almost all of them have reported that the exercise program group performed better on cognitive tests, with the same trend found in healthy participants, stroke survivors, and even Alzheimer’s patients.
Much of this is thought to be down to a molecule called brain-derived neurotrophic factor or BDNF. This molecule has gained a reputation among neuroscientists as ‘the brain fertiliser’ for its remarkable ability to stimulate the growth of new neurons and strengthen the connections between them.
“Muscle contractions increase BDNF while your platelets in the blood actually store a lot of BDNF,” says MacPherson. “So with increased blood flow due to exercise, your platelets can release more of it into the circulation.”
Through studies carried out in cells and animals, MacPherson’s lab has even shown that BDNF prevents the accumulation of tiny beta-amyloid protein fragments in the brain by altering the activity of different enzymes, which could explain why exercise helps to diminish the risk of Alzheimer’s.
But BDNF is not the only beneficial molecule released when you exercise. Last year, a study in the journal Neuron showed that exercise causes the production of a hormone called irisin which is capable of clearing amyloid plaques.
Christiane Wrann, an assistant professor of medicine at Harvard Medical School, who was involved in the study, has been so fascinated by irisin that she is now looking to develop an artificial form of it as a therapeutic for various neurodegenerative diseases including Alzheimer’s and Parkinson’s.
“It’s a small hormone which works on neuroinflammation and plaque clearance which makes it very relevant for Alzheimer’s disease,” she says. “I think there’s three or four properties of irisin that make it a really promising drug target.”
How much exercise and which intensity is best?
MacPherson gives a wry smile when this question is broached. “Everyone wants to know exactly what they need to do, and that’s a difficult one to answer,” she says.
The NHS guidelines advise you to do some sort of aerobic exercise, or physical activity which raises your heart rate, for at least 30 minutes per day, five days per week.
MacPherson says that BDNF production correlates with exercise intensity, so your body will produce more when doing higher-intensity forms of activity such as interval training. However, she says it is important for people to do what they feel capable of, and any form of exercise, no matter how mild, will still hold some benefit for the body and the brain.
“I think as an individual, you need to think, how much time do I have and what do I enjoy?” she says. “Even if you’re only able to do moderate intensity exercise, you still get an increase in BDNF, and there’s also the increased blood flow which delivers more oxygen and nutrients to the brain which will also enhance brain cell growth.”
The scientific reason exercise boosts your mood
Exercise has also been known to have the capacity to provide relief to people struggling with symptoms of depression, such as low mood or anhedonia, which refers to a loss of pleasure in previously rewarding activities.
At University College London, cognitive neuroscientist Professor Jonathan Roiser is currently leading a Wellcome-funded clinical trial to try and understand more about why exercise is so beneficial for mental health.
“I’ve long been interested in the information processing aspects which go wrong in depression and how they contribute to symptoms,” he says. “There are other symptoms that tend to cluster together with anhedonia such as fatigue and difficulty with decision-making, and there are some hints that exercise is specifically targeting these kinds of symptoms.”
Roiser’s trial will examine the greater benefits of aerobic exercise, where participants get out of breath and break sweat, compared to mild stretching and relaxation, in people with depression.
The aim is to get further proof for some of the major theories behind how exercise benefits mental health, such as stimulating the production of dopamine, which is involved in motivation, as well as dampening down inflammation.
“A lot of depressed people experience what we call chronic inflammation which prevents dopamine neurons from firing and perhaps contributes to their symptoms,” he says. “So the anti-inflammatory effects of exercise are a core part of how we think it’s working.”
As we discover more and more about how exercise protects the body, it could even lead to a new class of drugs, known as exercise mimetics which could provide some of the benefits of physical activity to the disabled and frail.
But for the rest of us, researchers have one simple message – whether it’s the gym or playing sports, making time to stay active will keep your mind healthier for longer.
“Whether it’s improving mood or cognitive function, exercise is one of the best things you can do for your brain,” says Wrann.

Fitness
Scientists reveal just how many hours of exercise new moms need each week

New moms are being strongly encouraged to engage in at least two hours of moderate to vigorous physical activity each week in the first three months after giving birth, according to new guidelines published in the British Medical Journal.
A panel of researchers and clinicians analyzed 574 studies to develop these updated postpartum exercise guidelines.
Their findings highlight the benefits of physical activity in reducing postpartum depression, weight retention, sleep disturbances and risks of chronic conditions such as diabetes and cardiovascular disease.
DragonImages
For new mothers without medical complications, the experts recommend a combination of activities such as brisk walking, cycling and muscle-strengthening exercises for at least 120 minutes per week—ideally spread over four or more days.
They also stress the importance of daily pelvic floor exercises to prevent urinary incontinence and aid recovery.
Guidelines co-author and physiologist professor Margie Davenport of the University of Alberta told Newsweek that historically, new mothers were advised to wait until six weeks after birth to start exercising.
“While this recommendation is intended to ensure adequate healing and recovery, some women are ready to be physically active well before six weeks, and others well after six weeks postpartum,” she said.
The new guidelines suggest that the progression to 120 minutes of moderate to vigorous physical activity should be personalized, gradual and based on individual symptoms.
Newsweek also spoke to Emily Claman, a certified prenatal and postnatal fitness expert, who explained that early movement soon after childbirth can help new moms recover.
“In those first three months, your exercise routine should focus on rebuilding strength, especially in the core and pelvic floor muscles, as well as restoring your posture, mobility and alignment,” she said.
Physical activity also boosts mental health, enhances energy and improves sleep quality, which is crucial for both physical and mental recovery, Claman added.
For mothers recovering from c-sections or birth complications, body mechanics expert and lead trainer at barre3 Lisa Schale-Drake suggests easing in gradually.
“Returning to exercise after having a baby can feel overwhelming and uncertain,” she said. “Let go of any set timeline and focus on rebuilding your strength in a way that feels right for you.”
A good place to start is breathwork to help rebuild the muscles in the deep layers of the core. Schale-Drake also advised seeking support from a pelvic floor physical therapist if needed.
The expert researchers stressed that all new mothers, regardless of complications, should aim to incorporate light daily movement, such as gentle walking, to avoid the risks associated with inactivity.
One of the biggest challenges for new moms is finding the time and energy to exercise. Both Claman and Schale-Drake agreed that workouts don’t need to be time-consuming to be effective.
“Time is precious as a new mom, so setting up a routine for yourself is the best way to make sure you stay consistent,” Clamnan told Newsweek.
Working out during nap time or taking two classes a week at a postpartum-focused studio can be great ways to stay active, she added.
Schale-Drake encouraged “exercise snacks,” aiming for five to 10 minutes of exercise rather than a 30-minute chunk.
Walking is also a great method of exercise for new moms—a “simple yet effective way to support your recovery,” she said.
Davenport also explained that the guidelines include a “Get Active Questionnaire” to help women determine when after birth it is safe to resume physical activity.
Postpartum depression, diastasis recti [where the vertical muscles of the abdomen separate] and pelvic floor issues are not considered reasons to avoid postpartum physical activity, Davenport said.
However, she continued, they can be common barriers to such exercise—and may call for additional screening, support and treatment by a healthcare provider or qualified exercise professional.
While meeting these updated recommendations may be challenging for some new mothers, expert researchers said that small efforts can make a difference.
“Even small steps towards achieving them will still promote physical and mental health benefits,” the panel said in a statement.
Do you have a tip on a health story that Newsweek should be covering? Do you have a question about postpartum recovery? Let us know via science@newsweek.com.
Reference
Davenport, M. H., Ruchat, S.-M., Jaramillo Garcia, A., Ali, M. U., Forte, M., Beamish, N., Fleming, K., Adamo, K. B., Brunet-Pagé, É., Chari, R., Lane, K. N., Mottola, M. F., & Neil-Sztramko, S. E. (2025). 2025 Canadian guideline for physical activity, sedentary behaviour and sleep throughout the first year postpartum. British Journal of Sports Medicine, 59(515–526). https://doi.org/10.1136/bjsports-2025-109785
Fitness
Planet Fitness donates exercise equipment to Westfield Fire Department
WESTFIELD — With the physical demands of being a firefighter/paramedic, the Fire Department recently enthusiastically accepted a generous donation of exercise equipment from Planet Fitness for the department’s training room.
“It’s priceless and we’re very grateful for the donation,” said the department’s Deputy Chief Eric Bishop about the six machines, all purple and shiny wedged between some of the department’s older equipment that looked like they had seen better days.
Fitness
Why jump training is ‘the most effective form of longevity training for women’ – and how to do it right

As you age, you might think low-impact exercise is the safest route for long-term health. But according to leading physiologist Dr Stacy Sims, this mindset could be holding women back. In fact, incorporating impact-based training – specifically, jump training – could be the key to building strength, resilience, and longevity well into later life.
‘If you’re looking at what you want to do when you’re 80 or 90, you want to be independently living, you want to have good proprioception, balance, you want to have good bones, and you want to be strong,’ says Dr Sims. ‘This is where you should look at ten minutes, three times a week of jump training. We have to turn our brains away from everything that’s been predicated before to this point.’
Her advice comes on neuroscientist Andrew Huberman’s podcast, Huberman Lab, in which he says: ‘One of the most common questions I get is what is the most efficient way for a woman older than 50 to train for the maximum healthspan and lifespan benefits.’
On Instagram, Dr Sims writes: ‘Jump training and plyometric exercises involve explosive movements, such as jumping, hopping, and bounding, that help to improve muscle power, speed, and agility. Women often look aghast when they see that I put plyometric training front and centre in my “Menopause for Athletes” programming. We’ve been taught that we should be taking it down a notch when we get older, not turning it up. But that is just not true. Women of all ages benefit from including plyometrics in their training.’
It makes sense that the older you get, the more apprehensive you feel about impact training like plyometrics (another name for jump training), but Dr Sims is adamant you’re missing out on some big benefits. Here’s how to do it.
What is jump training?
Dr Sims explains: ‘[Jump training] isn’t your landing softly on your knees, this is like impact in the skeletal system. A colleague and a friend of mine Tracy Kissel did a PHD and post research on this, and is developing an app on it to show women how to jump to improve bone mineral density. Over the course of four months of this, women have gone from being osteopenic to normal bone density, so it’s a different type of stress. It’s ideal if your concern is decreasing bone density – which a lot of women do have as a concern because they lose about one third of their bone mass at the onset of menopause.
‘If you don’t do something as an intervention – so we see a lot of women are like, “Oh I’m going to go on menopause hormone therapy to stop bone loss.” Yeah, this can be a treatment, but I always look at an external stress that we can put on the body that is going to invoke change without pharmaceuticals – so, jump training.
Jump training benefits
‘And just to drive home that point about all ages: a systematic research review of the recent literature on plyometrics and older adults aged 58 to 79 reported that plyometrics often improved muscular strength, bone health, body composition, posture, and physical performance. None of the studies reported increased injuries or other adverse events from plyometric exercises among participants. The researchers concluded, “Plyometric training is a feasible and safe training option with potential for improving various performance, functional, and health-related outcomes in older persons.”‘
Jump training exercises – and how to get started
‘Plyometric exercises involve explosive, high-intensity movements, so it’s important to do them correctly to do them safely.
‘Let me also be clear that, unless you’ve already been engaged in some form of plyometric training, I’m not going to recommend that you start doing lots of bounding or jumping right out of the gate. You need to build up to it and establish good form. And always warm up beforehand so your muscles and connective tissues are ready to go.
‘To get the form down and condition your connective tissues to start jumping, you can start by simply bouncing up onto your toes and dropping into a squat. Start by standing with your legs hip to shoulder-width apart, feet flat on the floor. Bend your knees slightly and immediately straighten them again, bouncing up onto your tiptoes. Pause, then lower back down, dropping into a full squat, making sure that your knees track over your feet and don’t cave in. That will be your landing position when you start jumping.
‘Once you’re comfortable there you can do a depth drop, or reverse plyo drop. This is where, instead of jumping up onto a box or step, you start on a raised platform and step off to land on the ground. To do it, start on a step or box about 12 inches off the floor. Step off and land softly, immediately dropping into a squat position, again, keeping your knees straight ahead and not caving in toward each other. You can do 3 to 4 sets of 4 to 6 drops.
‘As you get comfortable absorbing the force of landing, you can start on the floor and do squat jumps. Stand with your feet wider than shoulder-width, feet turned out a little. Extend your arms straight in front of you. Squat down until your butt drops below knee level. Quickly extend your legs and jump into the air. Land softly, immediately dropping into another squat. Repeat 3 to 4 sets of 4 to 6 jumps, working your way up to one to two sets of 8 to 10 jumps. (Burpees are also a good way to sneak in squat jumps!)’
Once you’ve built up a solid and safe foundation, Dr Sims advises including the following exercises:
- Squat jumps
- Jump lunges
- Burpees
- Box jumps
- Tuck jumps
- Broad jumps
- Plyo push-ups
Forms of training to practice alongside jump training
‘Jump training, heavy resistance training and sprint interval training are the three key things from a training standpoint,’ Dr Sims says.
Heavy resistance training
On Instagram, Dr Sims explains how to do heavy resistance training:
- How many reps to go for: ‘Heavy lifting is defined as lifting 6 reps or less with as much weight as possible. It’s obviously not something that you jump straight into without building up to it, especially if you’re new to resistance training.
- Best exercises to lift heavy: ‘A little goes a long way! You should not be lifting heavy for every single exercise. Instead, you want to reserve lifting heavy sh*t (LHS) for big, compound lifts like squats, deadlifts, and chest presses, which spread the load across multiple large muscles. That way you’re not overstressing any single muscle or joint.
- Safety tips: ‘Safety is paramount here. Make sure you get expert instruction on load and technique. If you are new to lifting, book a few sessions with a trainer to learn proper technique and nail that down before adding weight.
- How to progress with reps and sets: ‘LHS will not happen overnight. It can take months to build up to heavy loads if you are new. Expect to start with more moderate loads, lifting 2-3 sets of 8-15 reps to build a foundation and muscular endurance.
- When to increase the weight you’re lifting: ‘After four to six weeks, you can bring the weight up and the repetitions down, so you’re lifting 5 sets of 5 reps. When that becomes comfortable, you can aim for 4 to 6 sets of 3-5 reps.’
Sprint interval training
- Benefits of sprint interval training: ‘For menopausal women, high-intensity sprint interval training sessions can provide the metabolic stimulus to trigger the performance-boosting body composition changes that our hormones helped us achieve in our premenopausal years. One of the biggest benefits of SIT training is improvement in body composition (and cardiovascular health). SIT training increases lean muscle mass and reduces fat mass in a relatively short period of time. In a 2019 study published in Medicine & Science in Sports & Exercise, researchers had a group of postmenopausal women, ages 47 to 59, perform 20-minute bouts of SIT – alternating eight seconds of sprinting on a stationary bike at about 85% of their maximum heart rate with 12 seconds of easy pedaling – three times a week for eight weeks. By the study’s end, the women had lost fat, regained lean muscle mass, and improved their aerobic fitness by 12% after what amounted to only eight hours of exercise over eight weeks.
- Heart rate zone to aim for: ‘The key here is INTENSITY. In high-intensity interval training, alternating short bursts of hard exercise are followed by relatively short recovery periods. So, if you’re using heart rate as a guide, anything that sends your heart rate above about 85% of your maximum is high intensity. When you reach your menopausal years, it’s very important to incorporate the shortest, sharpest form of HIIT: sprint interval training.
- Duration of sprint intervals to aim for: ‘As the term indicates, SIT sessions include super-short, 10- to 30-second sprint-style efforts. They are extremely beneficial for both peri- and postmenopausal women.
Nutrition tips for women over 50
‘From a nutrition standpoint, protein is so important. When you start telling women they need to look at around 1-1.1g per lb which is around 2-2.3g per kg per day, they’re like, “Whoa, that’s a lot of protein!” It is, because you haven’t been conditioned to eat it. It doesn’t all have to be animal products; you can also look at all the different beans.
‘In order to build the muscle and to keep the body composition in a state that we want it to keep going for longevity, those are the big rocks: sprint interval training, heavy resistance training, jump training and protein.’
As Women’s Health UK’s fitness director (and a qualified yoga teacher), Bridie Wilkins has been passionately reporting on exercise, health and nutrition since the start of her decade-long career in journalism. She secured her first role at Look Magazine, where her obsession with fitness began and 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.
Now, she oversees all fitness content across womenshealthmag.com.uk and the print magazine, spearheading leading cross-platform franchises, such as ‘Fit At Any Age’, where we showcase 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.
-
News1 week ago
Vance to Lead G.O.P. Fund-Raising, an Apparent First for a Vice President
-
News1 week ago
Trump Administration Ends Tracking of Kidnapped Ukrainian Children in Russia
-
Technology1 week ago
The head of a Biden program that could help rural broadband has left
-
Business1 week ago
Egg Prices Have Dropped, Though You May Not Have Noticed
-
News1 week ago
Black Lives Matter Plaza Is Gone. Its Erasure Feels Symbolic.
-
News7 days ago
Trump’s Ending of Hunter Biden’s Security Detail Raises Questions About Who Gets Protection
-
News1 week ago
U.S. to Withdraw From Group Investigating Responsibility for Ukraine Invasion
-
World7 days ago
Commission warns Alphabet and Apple they're breaking EU digital rules