Fitness
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.
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.
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.
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.
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.
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.
Kim Schewitz
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?
It’s important to have goals in mind as you set out on your fitness journey, whether you’re trying to lose weight, gain muscle or train for a race.skynesher/Supplied
January is notoriously the busiest time of year at the gym. A survey from Ipsos reported that a third of Canadians made exercise-based resolutions for the new year, with many folks working out for the first time or returning to fitness after some time away. If you’re new to exercise, the gym can feel like an intimidating place. But it doesn’t need to be. Below we’ve put together a few suggestions to help you get started.
Have a plan going in
For success at the gym, it’s crucial to have a plan. Before you start, it’s important to identify your goals. Are you looking to get stronger? Training for a race or competition? Do you want to improve body composition? While almost any consistent exercise is going to improve your overall health, specific results require specific training.
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Those completely new to working out may want to invest in a few sessions with a personal trainer. A reputable trainer will be able to put together a plan based on your preferences and skill level, while walking you through the proper form for each exercise. If cost is an issue, many gyms offer a free intro training session as a sign-up perk. There are also hundreds of different workout programs you can find online and video tutorials outlining proper form.
If you’re intimidated to exercise on your own, a fitness class allows you to follow along with an instructor while getting some quick pointers on how to properly perform the workout. Many gyms offer discounted or free classes to first-time visitors.
Trying to do too much, too fast will burn you out, leave you injured or both
When you’re motivated by a new year’s resolution, it’s tempting to pencil in long gym sessions multiple times a week. But that kind of regime is rarely sustainable. If you’d like to make exercising a habit beyond January – and you’ll need to for any kind of lasting results – it’s best to think about what you can do in the long term.
“You can either do an hour of weightlifting a few days a week, and actually do it, or you have these imaginary 10-hour training sessions you’ll never actually have time for,” said Dan John, strength coach and author. “I try to focus on [programs that are] doable, repeatable and reasonable.”
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Similarly, trying to immediately push beyond your physical limitations is a great way to get injured. For weightlifting, it’s important to consider proper warm-ups, active mobility exercises and learning the right techniques before trying to lift anything too heavy. For cardio, Canada Running Series offers a Couch to 5K plan that eases newcomers into jogging by starting small and gradually increasing the length/difficulty of each run.
Follow basic gym etiquette
The gym is a shared public space. Everyone there is trying to get in a good workout. That’s harder to do when people are having phone conversations, listening to videos without using headphones and refusing to wipe down their equipment after use.
In March, fitness trainer Paul Landini wrote an article explaining some unofficial rules to follow when going to the gym, including being mindful of other people’s space and making sure you’re not monopolizing equipment during busy hours.
Try to find what you like about the gym
Changes in body composition, strength and overall health take time. They also need upkeep over the long term. Building a consistent fitness habit is something that will help with all those goals. One of the best ways to do that is finding something at the gym you genuinely enjoy doing. That can be working out with a friend to add a social aspect to exercise and accountability to show up. It can entail learning a new fitness-adjacent skill such as boxing or training for a competition like Hyrox. It can be rooted in the sense of accomplishment that comes with getting stronger. Whatever the reason, finding the joy in exercise is going to be key if you want to move beyond short-term motivation.
SIOUX FALLS, S.D. (Dakota News Now) – Finding time to work out as a mom with young kids can be a challenge in itself, especially when you’re new to an area and don’t know where to start. However, a new fitness option strolled into Sioux Falls today. iStroll offers moms the chance to work out and meet other moms all while their kids can play or even join alongside them.
iStroll is a national organization that has more than 35 locations in the country but this is the first time one opened in South Dakota. It’s a full body workout that incorporates dumbbells, body weight, and jogging strollers when the weather’s nice.
“I found iStroll in Oklahoma and fell in love,” said Kelsi Supek who started the affiliate in Sioux Falls. “We made friends. It became our entire social network. The kids loved it and then we moved to Arizona during COVID. And all the moms were stuck at home. They were inside with our kids and lonely, honestly. And we were like, why can’t we start an iStroll and be out at the parks with the kids every day? And it took off.”
When Supek moved to Sioux Falls, she was encouraged by her family to start an affiliate and own it herself.
“Gym daycares did not work out for my children,” said Supek. “I would get 10 minutes into a class and then I’d have that person trying to knock outside the yoga studio going, Can I have Kelsey and her kids screaming in daycare? And it just didn’t work for us. So at iStroll they could be with me or I could be breastfeeding the baby as I was teaching in class.”
Classes are planned to continue each Wednesday and Friday at We Rock the Spectrum and First Presbyterian Church. For a full schedule for January and February, you can look at their Facebook. The first class is also free and memberships are for the whole family.
“Letting the kids see you work out is, it’s similar to homeschooling where like, you know, how are they going to love working out if they don’t see you working out,” said Kelly Jardeleza, a stay-at-home mom of three kids. “Whereas at other gyms they put them in a room and they don’t get to watch you. And how are you going to inspire them if they’re not watching you do it?”
Copyright 2026 Dakota News Now. All rights reserved.
There’s no bad time to take a more active interest in your health, but the new year, for lots of us, feels like a fresh start. Maybe you’re planning to sign up for a 10k or finally have a go at bouldering, eat a bit better or learn to swing a kettlebell. Maybe you want to keep up with your grandkids — or just be a little bit more physically prepared for whatever life throws at you.
To help things along, Guardian Live invites you to a special event with public health expert Devi Sridhar, journalist and author Mariella Frostrup, and health and fitness columnist Joel Snape. They’ll be joining the Guardian’s Today in Focus presenter Annie Kelly to discuss simple, actionable ways to stay fit and healthy as you move through the second half of life: whether that means staying strong and mobile or stressing less and sleeping better.
To make the whole event as helpful as possible, we’d love to hear from you about what you find most challenging — or confusing — when it comes to health and exercise. What should you actually be eating, and how are you going to find the time to make it? What sort of exercise is best, and how often should you be doing it? Is Pilates worth the effort — and should we really all be drinking mugfuls of piping hot creatine?
Whether your question is about exercise, eating, or general wellness, post it below and we’ll put a selection to our panel on the night.
Share your experience
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