Most people associate nasal strips with snoring and sleep. You slap one on before bed, your partner sleeps better, everyone wins. But the same mechanic that opens your airway at night works just as hard when your body is demanding more oxygen mid-session.
Athletes have been using nasal strips for decades. The NBA. AFL players. Cyclists. Runners. Not because they look good, but because breathing better during training is a genuine performance lever and it's one most gym-goers haven't touched yet.
FLEX clear nasal strips are built specifically for this. Discreet enough to wear through any session, adhesive that holds through sweat, and the same nasal-opening lift that makes the difference between grinding through a set and actually having something left in the tank.
Here's what the science actually says, and what to expect when you try them.
Why Breathing Through Your Nose During Exercise Actually Matters
Most people breathe through their mouth the moment a workout gets hard. It feels like the logical move more air, faster. But the route air takes into your body matters more than most people realise.
Nasal vs mouth breathing: what's actually different when you train
Your nose does things your mouth can't. It filters, warms, and humidifies incoming air before it hits your lungs, making it easier to absorb. It also regulates airflow in a way that supports more efficient oxygen exchange at lower intensities.
When you switch to mouth breathing, you lose all of that. The air coming in is unfiltered, drier, and moves at a rate that's harder for your lungs to process efficiently. You may feel like you're getting more air, but your body is working harder to use it.
Research published in Frontiers in Physiology found that nasal breathing during exercise is associated with better ventilatory efficiency, meaning your body extracts oxygen from each breath more effectively. That efficiency matters most during sustained effort the kind of cardio, circuit training, or lifting that runs longer than a few seconds.
Nitric oxide and why it gives nasal breathing a performance edge
Here's the part most people don't know about. Your nasal passages and sinuses produce nitric oxide, a molecule that acts as a vasodilator it widens blood vessels, which improves blood flow and helps oxygen reach your working muscles faster.
Research comparing nasal and oral breathing during exercise has found that nasal breathing produces measurably higher nitric oxide output in exhaled air. When you bypass the nose and breathe through your mouth, you cut off a significant portion of that nitric oxide production.
Think of it as a natural performance supplement that's already built into your breathing you just have to use the right route.
What Nasal Strips Actually Do When You Work Out
Understanding why nasal breathing is better is one thing. The problem is that for a lot of people, their nasal passages don't open wide enough to make it practical during intense training. That's where strips come in.
How the strip increases peak inspiratory flow
A nasal strip physically lifts the sides of the nasal passage outward. This targets the nasal valve the narrowest point of your airway and holds it open so air moves through with less resistance.
Studies have shown that nasal strips increase peak inspiratory flow from around 2.55 litres per second to 2.86 litres per second. That's a meaningful jump in how much air your body can pull in with each breath, without any extra effort on your part.
Why the nasal valve narrows under intensity and how a strip counters it
Here's something most people don't know: your nasal passages actually narrow during hard exercise. The Bernoulli effect the same physics that makes aeroplane wings generate lift causes the sides of your nostrils to collapse inward as airflow increases. The harder you breathe, the more your nose works against you.
A nasal strip counteracts this directly. It holds the nasal walls stable so they can't collapse inward, keeping your airway open even when you're breathing hard through a final set or the last kilometre of a run.
Why the Clear Strip is Built for the Gym
The FLEX clear nasal strip is the one made for training. Transparent, low-profile, and with an adhesive designed to hold through sweat, it's built for the environment the black sleep strip isn't optimised for.
Discreet enough to wear through any session
Nobody at the gym is going to clock a clear strip across the bridge of your nose. It sits flat, blends in, and stays out of your peripheral vision. You'll forget it's there within a few minutes which is exactly the point.
One FLEX customer who uses them during spin classes put it plainly: the strips were comfortable enough that they forgot they were wearing one, even through the hardest intervals. That kind of comfort is non-negotiable when you're pushing hard and the last thing you need is a distraction.
Adhesive that holds through sweat
The adhesive on the FLEX clear strip is skin-safe and tested for active use. Apply it to clean, dry skin before you warm up and it'll stay in place through the full session. If your skin is oily or you're applying it mid-workout, press firmly along the edges after placing it that's what locks it in.
Works for running, lifting, spin, team sports
The same strip that works in a spin class works on a treadmill, under a barbell, or on a field. There's no sport-specific version the mechanics of opening the nasal valve apply across every activity where breathing matters, which is all of them.
A verified FLEX customer who attends spin classes several times a week described the experience clearly: during their first class wearing a strip, nasal breathing felt noticeably easier, which helped them stay more relaxed through the hardest parts of the session. They also noted the strips were comfortable enough to forget they were there which says a lot about adhesion during a high-sweat indoor class.
Nasal Strips vs Mouth Breathing: What Happens to Your Performance
When your nasal passage is restricted, your body defaults to mouth breathing. That default has real consequences for how you perform and how quickly you recover.
How mouth breathing during training affects endurance and recovery
Mouth breathing during exercise has been linked to higher perceived exertion. A 2025 study found that people reported working harder at the same intensity when breathing orally compared to nasally, even when actual power output was similar. The workout feels harder than it needs to.
That same research found that nasal breathing led to significantly faster post-exercise muscle recovery. Muscle oxygenation returned to baseline quicker in the nasal breathing group meaning your muscles start recovering sooner after you stop working.
For anyone training multiple times a week, that recovery advantage compounds over time.
Training your body to breathe better over time
Nasal strips aren't a crutch they're a tool that makes nasal breathing accessible during exercise so your body can start adapting to it. Over time, consistent nasal breathing during training helps develop the habit and the capacity to sustain it at higher intensities.
Start with moderate-intensity sessions where nasal breathing feels manageable. Add the strip before you warm up so you're set from the first set.
How to Use Nasal Strips at the Gym: First Timer Guide
Application before a sweaty session
Start with clean, dry skin. If you've already started warming up or your skin is naturally oily, wipe the bridge of your nose with a dry cloth first. Peel the backing, position the strip across the widest part of the bridge, and press firmly along both edges for about ten seconds. That's what activates the adhesive.
Don't apply it mid-workout onto damp skin it won't hold as well. Get it on before you get sweaty.
Where to place it for maximum lift
The strip should sit across the middle of your nose, centred on the bridge, with the ends extending down toward the nostrils. The goal is to have the spring-loaded section sitting directly over the nasal valve. Too high and it won't lift the right area. Too low and it'll be uncomfortable.
Check out the FLEX how to apply guide for a visual walkthrough if you're unsure about placement on your first go.
One FLEX customer who tried the strips on a social run described an immediate difference easier breathing and enough airflow to hold a conversation the whole time. That's the effect of a properly placed strip doing its job.
Frequently Asked Questions
Do nasal strips actually help during exercise or is it placebo? The mechanics are real. Nasal strips physically increase peak inspiratory flow by widening the nasal valve, which reduces airflow resistance. Research backs the improvement in nasal airflow during exercise. Whether you notice it will depend on how restricted your nasal passages are normally.
Will the strip stay on during an intense workout? Yes, if applied to clean, dry skin before you start. The FLEX clear strip uses a skin-safe adhesive designed to hold through sweat. Press the edges firmly when applying and avoid touching it once it's on.
Can I use the clear strip for sleep as well as training? Yes. The clear strip works for both. If you want a dedicated sleep option, the FLEX black nasal strip is the primary sleep product, but the clear strip performs the same core function.
Is nasal breathing actually achievable during hard exercise? At moderate intensity, yes, for most people. At very high intensity, most people will naturally switch to combined nose-and-mouth breathing. The strip makes the nasal portion of that easier, which still delivers the nitric oxide and filtration benefits. You don't have to be exclusively nasal breathing for the strip to help.
Ready to Breathe Better Through Every Session?
Most people optimise their training, their nutrition, and their recovery. Almost nobody optimises their breathing during the session itself.
FLEX clear nasal strips are the lowest-effort change you can make to how you train. No prescription. No warm-up period. Stick one on and breathe better from the first rep.
Try FLEX with a 30-day risk-free trial and free Australia-wide shipping. See what a full session of proper nasal breathing actually feels like.
Shop FLEX clear nasal strips or grab the Breathing Bundle to cover both training and sleep.
Rated 4.9/5 by Aussie athletes and sleepers. Because how you breathe determines how you perform.