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I took a class to boost my VO2 max — and finally found a way to make cardio fun

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I took a class to boost my VO2 max — and finally found a way to make cardio fun

I have a strange question, but stay with me: Have you ever thought about how long you can run without breathing through your mouth? In a dark basement in central London I recently discovered that, for me, the answer is: Not for very long.

Apparently, that means my VO2 max, or ability to send oxygenated blood to my muscles, and how well my muscles can use that oxygen during intense exercise, is quite low.

Translation: I’m unfit.

I do low-impact strength training like yoga and pilates most days, but no cardio. I’ve tried to get into running, but it never sticks, and I find cardio machines boring.

I learned specifically how bad I am at cardio at V02:MAXED, a new class at London’s GymBox. I knew one session wouldn’t transform my health, but I was interested to try the first class I’d seen marketed around VO2 max.

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I wondered if exercising with a specific goal might motivate me to finally form a cardio habit, and if the class — and the nose strips we had to wear while working out — was just a fad.

Once the preserve of high-level athletes, in recent years, VO2 max has become a buzzy measure of cardiovascular fitness among runners, fitness competition enthusiasts, and health optimization bros. People are obsessed with it because it’s said to be a strong predictor of longevity.

As I’m not an endurance athlete, my low score may not seem like a big deal, but having a high VO2 max is linked to a longer life, and a reduced risk of conditions including cardiovascular disease, cancer, and diabetes.

I don’t care that I can’t run five kilometers in under 30 minutes, but I do care about staying active and healthy as I age.

To increase your VO2 max, you have to do a mixture of shorter high-intensity and longer, easier workouts. VO2:Maxed is a 16-week course where clients train at a range of intensities. The class I did was the fourth in the series.

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Feeling nervous about entering a gym that uses the words “gnarly,” “sadistic,” and “savage” to describe some of its classes, I descended the staircase from the reception area to the dimly lit bodybuilder’s playground below with trepidation.


A gym.

The class involved switching between an assault bike and ski machine.

Kim Schewitz



We had to breathe through our noses for as long as possible

In the 50-minute class, we repeated three-minute sets on a stroke machine (ski or rower) and a cycle machine (bike or treadmill), with 45-second breaks in between. I used a ski machine and an assault bike.

What made the class unique was the breathwork. Our instructor, Firas Iskandarani, a Hyrox and Crossfit coach, explained that we should aim to breathe through our noses for most of the class. He called this type of breathing “gear one,” and breathing in through the nose and out through the mouth “gear two.”

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We were told to note when we had to “switch gears.” Iskandarani said this should happen after around 90-seconds to two-minutes, but I struggled to get to one minute.

As a rough guide, the longer you can stay in gear one, the higher your VO2 max is likely to be, he said. The idea is that, over time, you will need to switch gears less quickly, which indicates your aerobic capacity has increased.

About halfway through the class, we were given nasal strips to stick on the fleshy part of our noses, and encouraged to notice if it helped us stay in gear one for longer.

It’s thought that widening the nasal canal could help to increase endurance by allowing more air through the nose. But one 2020 meta-analysis published in the European Archives of Oto-Rhino-Laryngology found that wearing a nasal strip while exercising didn’t improve VO2 Max or heart rate. Still, lots of runners and athletes swear by them, like the elite tennis player Carlos Alcaraz, who wears them during his matches.

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I felt that the nasal strip helped a little, but it kept peeling off as my nose got sweaty.

Breathing through your nose while exercising is thought to help you stay in Zone 2

Nasal breathing is not directly linked to improving VO2 max, but is thought to help the body use oxygen more efficiently.

It also encourages you to stay in Zone 2, or at 60-70% of your maximum heart rate, while you’re exercising. Your muscles have more access to oxygen in Zone 2, making it an effective way to increase aerobic endurance.

Once you enter Zone 3, 70% to 80% of your max heart rate, you’re moving at an intensity that’s too much for the available oxygen supply, which causes you to get out of breath.

Breathing through my nose and doing cardio at the same time was hard

I found there was a lot to remember and focus on in this class: not only understanding the different gears, but trying to stay in gear one while checking the clock to see when I started mouth breathing.

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All of this mental arithmetic was required on top of the three-minute sets of cardio, which, I think is fair to say, is a long time. My mind kept wandering and I kept accidentally mouth breathing before I’d actually reached my threshold.

It was also tricky to go at a slow enough pace to stay in gear one for even a minute. After about thirty seconds I started to lose my breath. I suppose that tells me I have some work to do in this area.

That being said, I wasn’t huffing and puffing or red in the face afterwards like I usually am after a 35-minute run. But my arms did get very tired from pulling the ropes on the ski machine and moving the handles on the assault bike back and forth.


A woman uses a ski machine in a gym.

Kim Schewitz during the VO2 max-boosting class that lasted 50 minutes.

Kim Schewitz

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A structured class made working on my cardio feel more achievable

If I did this class again I would pace myself better so that I wouldn’t get out of breath so quickly. But I think for a cardio beginner like me, it was a little too technical and advanced.

Iskandarani said that part of the demand for the class came from Hyrox fans and CrossFitters, who are already pretty fit and looking to increase their endurance for competitions.

But I found doing cardio in such a structured way and with a group of people much more fun and motivating than doing it alone. Going forward, I think I’ll stick to cardio classes rather than running every once in a while, getting bored, and trying again when enough time has passed for me to forget how arduous I found it.

By focusing on my breath, it became apparent that my cardiovascular fitness is lower than I’d like, and I’m only 28. I wondered how it would inevitably deteriorate over time, and if I’m struggling to get through a class like this now, it’s only going to get harder when I’m in my 50s, let alone 80s.

As for the VO2 max workout, I don’t think it was the right cardio class for me, but it’s motivated me to continue my search. Anyone for Zumba?

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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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