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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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The Best Fitness Trackers, According to Months of Real-World Testing

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The Best Fitness Trackers, According to Months of Real-World Testing

In the last few years, the fitness tracker market has grown exponentially. Now, you can find something for every taste, whether you prefer a discreet ring or a large screen, as well as for every personality, from the health metric-obsessed to the person who simply wants better sleep.

And in 2026, I tried many of the most popular devices on the market, from Apple, Oura, Garmin and more. Some days, I had a forearm-high stack of watches as I compared how they tracked my data for runs, strength training sessions, sleep and more. And I had some clear favorites.

Below, I’m sharing the top trackers that I tried last year, from screen-free options to the best pick for runners.

Best smart watches

Best affordable tracker:

If you’re looking for a fitness tracker that can give you all of the basics (and then some) at a relatively affordable price, the Fitbit Inspire 3 is one of the best devices out there, in my opinion. While it doesn’t have some of the bells and whistles that other gadgets offer, it really does quite a bit. Over the course of about a month of wear, I found the sleep, activity and general health data to be pretty accurate.

I also like that the device feels less bulky than many of the other trackers with screens that I have tried. The screen is 5 millimeters, which is just enough to show you the relevant stats during workouts, read notifications and texts and more without feeling like an eyesore on your wrist. However, that comes with the caveat that those with larger fingers may struggle with the small touchscreen.

To access all of your data, you’ll have to go to the app. It takes some playing around to figure out where to find everything, but once I did, it was easy to stay up to date on all my metrics. While you can access most of the basic data with just the app and watch, you’ll also get a six-month Fitbit Premium membership when you purchase, where you can see even more metrics and access additional workout videos as well.

Best for runners:

While I’ve tried a couple of Garmin’s devices and loved them all, for casual runners, the Garmin Forerunner 55 is a great entry point. That’s not to say you can’t use it for other activities. It allows you to log different activities and monitor sleep data, but I’ve found it to be the most helpful for running.

If you’re someone who regularly runs races, whether it be 10Ks or full marathons, you can find your race on the Garmin app and start a countdown and the app will even create a custom training plan for you with workouts that you can send to your device. I love the ability to create custom workouts with different pace and distance goals throughout your run (which is particularly great for anyone working on speed). If you’re running below or above your desired pace, the watch will send you an alert to keep you on track.

It has an impressive battery life of up to two weeks on a single charge, too, so I’ve been able to go on trips and leave the charger behind. In fact, on a 14-day trip, I got home and still had a day’s worth of charge left.

This is also the only device I tried without a touchscreen, which I really liked. That meant that I wasn’t fumbling with the buttons with sweaty hands on hot days or cold, gloved ones in the winter. The buttons are large enough that I could press them to pause or restart my workout, even when the watch was hidden by a jacket sleeve.

Best affordable Apple Watch:

The Apple Watch SE is the brand’s most affordable model, and I recommend it for the person who wants to stay connected, track workouts, monitor health and more, but doesn’t mind charging every day. (Though a big benefit of this new model is that it charges much faster than previous versions.)

New features include temperature sensing for more accurate vitals measurements, a daily sleep score to give you a better idea of how well-rested you are for the day, an always-on display and the ability to start workouts on your phone and track them on the watch.

Plus, if you have an iPhone, an Apple Watch is by far the best option out of all the available trackers for staying connected. You can easily respond to texts, check your email, use your Apple Wallet, answer calls and more. It makes functioning without a phone easy if I need to accomplish something without my phone nearby.

Best for iPhone users:

Apple released its Apple Watch 11 earlier this year, and for anyone questioning if they should make the upgrade, the new watch has one major perk: Extended battery life. According to the brand, you can get up to 24 hours of normal use from one charge, and I find that to be pretty accurate. But when you put it on low power mode (which I often do), you can get more than a day of use.

When looking at the other models, I would say the biggest draw of this one is that you get a much better battery life for just a little more money than the SE (considering that it’s on sale right now). Plus, like the other new models Apple released this year, the Series 11 includes the sleep score feature and can be used to spot signs of possible hypertension or high blood pressure.

I’ve also had issues with my Apple Watch screens scratching in the past, so I appreciate that the brand says this one is twice as scratch-resistant as the previous model.

Best for endurance athletes:

If it weren’t for the high price, I would recommend the Apple Watch Ultra to everyone. But for those who are active and willing to invest, I consider it to be the all-around best option among Apple’s watches.

The Ultra is designed specifically with athletes and adventurers in mind. It has the longest battery life of any of the Apple Watches, with up to 42 hours of battery life (and up to 72 hours on low power mode), so it will last through long races and backpacking trips — or even just a couple of days of going through your normal routine. It’s also designed to be much more durable than other models, as it has a titanium case and a display made from sapphire crystal (which Apple says is one of the strongest naturally occurring metals on Earth). It’s also said to have a better-than-average GPS, so your data won’t be as affected when running in urban areas where there are a lot of tall buildings.

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Another thing that I really love about the Ultra is the additional Action button, which is customizable, so you can use it to control your workout, start a new interval or mark a segment. You can pause and end your workout using the buttons as well, so you don’t have to fumble with the touchscreen (which, if you have sweaty hands, you know is a big win).

If you spend a lot of time off the grid — say, trail running or climbing in remote areas — you can use the satellite feature to stay connected and send texts or your location, even if you don’t have WiFi or cell service. It can also be used to get help in case of an emergency.

Best screen-free trackers

Best for the data-obsessed:

If you’re a true wellness obsessive who loves data and seeing how behavior changes affect sleep, workouts and more, this is a great device to consider.

For each activity you do, you get an estimated strain score that tells you how taxing the activity was on your body (the score can range from zero to 21). These all factor into your strain score for the day, which includes everything from workouts to general daily movement, as well as stress and anxiety. After a night’s rest, you’ll also get a recovery score — a percentage between one and 100 — which factors in your activities and stress from the day before, your sleep performance, HRV, heart rate and respiratory rate. Each day, you also get the option to journal, so you can track behaviors, like stretching or taking supplements, and over time, you can track how the habits affect your recovery.

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The Whoop provides you with a lot of interesting data, but it also has features to help you understand it better. It uses AI to create a daily outlook, which will give you activity recommendations based on your sleep and activity data. There’s also a Healthspan feature, which takes your data (after 21 consistent nights of wear) and gives you your Whoop Age (a measure of your physiological age, which can be different from your actual age) and Pace of Aging (which is impacted by your daily lifestyle choices and can range from -1x to 3).

The battery life is also pretty hard to beat. The brand shares that you can get up to 14 days, and I’ve found that estimate to be pretty accurate. In fact, I’ve even occasionally gotten more than two weeks of use out of it from one charge. To charge the Whoop, you charge its battery pack separately and then can slide it onto the device while you’re still wearing it to add juice, so you don’t even have to miss a minute of data.

As someone who is super interested in using data to optimize health, I love the Whoop. However, as a runner who spends a lot of time focused on proper pacing during workouts, for those activities, I also typically wear a device with a screen, like my Garmin or Apple Watch, to make sure I’m meeting my goals.

When you purchase using one of the above links, you’ll get a year-long membership. After that, you can choose from one of Whoop’s three membership options: One ($149 per year), Peak ($239 per year) or Life ($359 per year).

The most discreet fitness tracker:

The Oura Ring has become one of the most trendy trackers of the last few years, thanks to its discreet — and I would even say, stylish — design. The ring features sensors along the inner band, which measure things like blood oxygen levels, temperature, respiration, heart rate variability and more.

In my opinion, one of the best things about the Oura ring (outside of its look) is how simply it breaks down the data. Each morning, it takes your data from the night and day before, and gives you three scores: Sleep, Activity and Readiness, all of which fall between zero and 100. Each one provides you with a broader view of how well rested you are for the day and how ready you are to challenge yourself.

If you’re in it for the workout tracking aspect, this is not the best option. Aside from the fact that it doesn’t have a screen (so you can’t actively see your stats while you’re in a workout), it doesn’t always sense lower-intensity workouts, like yoga or Pilates, so you often have to go into the app and add them after. Plus, in addition to the cost of the ring, accessing your data and all the features on the app costs $6 per month.

How we chose

Last year, I tried over a dozen fitness trackers, wearing them each for at least a week straight (most of the time much longer) for workouts, sleep and everyday activities. Throughout the year, I trained for multiple races, including a marathon and two half marathons, so I used many of the trackers for workouts related to my training. When choosing the best trackers, I kept in mind a range of factors, including price, battery life, connectivity and general features.

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Why trust Shop TODAY?

The Shop TODAY editors and writers search the internet to find the best products out there. We interview expert sources and use our own personal experiences with the product and brand to make shopping easier for our readers.

Emma Stessman is a writer for Shop TODAY. She has over a decade of experience in digital media — with nearly half of that time being focused on the health and wellness space. She has owned multiple fitness trackers from top brands over the years. At Shop TODAY she covers a range of topics, from new tech releases to expert-approved beauty trends. She is an avid runner and fitness enthusiast with a personal passion for health.

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The 150-minute Exercise Rule Helps Your Heart. But If You’re Serious About It, Better Aim for 600 Minutes

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The 150-minute Exercise Rule Helps Your Heart. But If You’re Serious About It, Better Aim for 600 Minutes
Credit: Unsplash.

Public health advice says you should get at least 150 minutes of brisk walking, cycling, running or other moderate-to-vigorous exercise each week.

However, a new study suggests that the target is just the bare minimum.

The widely cited 150-minute goal is not wrong. The new study found it offers a reliable first layer of protection against heart disease. But for people seeking a much larger reduction in cardiovascular risk, the amount of exercise associated with that benefit was far higher: roughly 560 to 610 minutes a week, or about 80 to 90 minutes a day.

A Minimum, Not a Magic Number

The study analyzed more than 17,000 adults in the UK Biobank who wore wrist activity monitors and completed a fitness test. Over nearly eight years of follow-up, researchers tracked heart attacks, strokes, heart failure and atrial fibrillation.

They found that meeting the current guideline was linked to a modest 8 to 9 percent reduction in cardiovascular risk across fitness levels. A reduction greater than 30 percent was associated with about three to four times as much weekly exercise.

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The findings do not mean that 150 minutes a week is useless — quite the opposite. The study suggests it works as a simple public health floor, one that benefits people regardless of whether they start out fit or deconditioned.

But the results also challenge the way many people understand the guideline. The number is often treated as a target to reach and stop at.

The researchers studied moderate-to-vigorous physical activity, a category that includes exercise intense enough to raise the heart rate, such as brisk walking, running and cycling. They also measured cardiorespiratory fitness using estimated VO₂ max, a measure of how efficiently the heart, lungs and muscles deliver and use oxygen during exertion.

This is a pretty important distinction. Fitness and physical activity are of course related, but they are not the same thing. Two people may report similar exercise habits and still differ in cardiovascular fitness because of genetics, age, health history, training response or earlier-life conditioning.

“Future guidelines may need to differentiate between the minimal moderate to vigorous exercise volume required for a basic safety margin and the substantially higher volumes necessary for optimal cardiovascular risk reduction,” they conclude.

Less Fit People Faced a Steeper Climb

Graph showing how much exercise per week is linked to different levels of cardiovascular risk reduction.Graph showing how much exercise per week is linked to different levels of cardiovascular risk reduction.

Participants wore an accelerometer for seven consecutive days between 2013 and 2015. They also completed a submaximal cycling test used to estimate VO₂ max. The researchers then linked these data to hospital and death records through October 2022.

During a median follow-up of 7.85 years, 1,233 cardiovascular events occurred. These included 874 cases of atrial fibrillation, 156 heart attacks, 111 cases of heart failure and 92 strokes.

The pattern was not simply “more exercise is better” in a straight line. Instead, the researchers found a non-linear relationship between activity, fitness and risk. Higher fitness appeared to provide its own protective margin. At the same time, increasing weekly activity lowered risk across the fitness spectrum.

For a 20 percent reduction in cardiovascular risk, people with the lowest fitness needed about 370 minutes of moderate-to-vigorous activity per week. People with the highest fitness needed about 340 minutes. For a 30 percent reduction, the estimates rose to about 610 minutes per week for the least fit and 560 minutes for the most fit.

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You might not like to hear this, but if you’re already unfit, you need to invest much more time and effort than someone who is fitter to reach the same cardiovascular protection. If that sounds like common sense, it is. But the new study is helpful because the figures it offers help frame things more clearly and offer a measurable goal.

Set Achievable Goals

The study was observational, so it cannot prove that exercising 600 minutes a week caused the lower risk. People who exercise more may differ in other ways, such as diet, income, sleep, access to care, smoking history or underlying health.

Also, not everyone can afford to exercise for 10 hours a week. In fact, most don’t. For older adults, people with heart disease, or those who have been inactive for years, that could be unrealistic or unsafe without medical guidance.

For broad public health, 150 minutes a week remains a useful and achievable goal. But if you can safely do more, the heart may keep benefiting well beyond that threshold.

The findings appeared in the British Journal of Sports Medicine.

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I Spent Years Believing Exercise Wasn’t for Me—Until I Ran My First Half Marathon at 35

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I Spent Years Believing Exercise Wasn’t for Me—Until I Ran My First Half Marathon at 35

“No one forced you to be here”: it’s a statement I’ve heard many times in many different ways over the years; at parties I didn’t enjoy, on weekends away when I had, in fact, felt forced to attend. Most recently, I said it to myself as I shuffled towards the start line at the Hoka Hackney Half Marathon. It was true; no one had forced me, and while that saying had previously always felt loaded — usually spewed in sulky moments when I wasn’t being fully amenable to the whims of whoever was lodging the insult at me — more recently, I have found it empowering.

I have a history of recoiling at anything with even a whiff of bootcamp vernacular, but at my weekly Pilates session, instructor Lucy Borrie likes to remind us that we chose to be there, and for the first time in my life, I’ve found that reminder reassuring rather than reprimanding. Before, I’d taken the saying as confirmation that I wasn’t meant to be there — that the space, and exercise at large, were not for me. No one forced you to be here, so if you’re not enjoying this, or you can’t complete the routine, then you are the problem: that is what I took that saying to mean.

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