You may not think about your lung health until it's hard to breathe. We focus on our heart health, our muscles, even our sleep patterns, but rarely do we give our lungs a second thought. Yet these tireless organs work constantly to deliver oxygen, remove carbon dioxide, and support the immune system.
This exchange happens thousands of times a day without us noticing. And as you age, your lungs — like any other organ — gradually change in ways that affect your breathing.
This article covers what actually happens to your lungs over time, what genuinely helps, and an honest account of where EWOT fits — including where it doesn't.
What Happens to Your Lungs as You Age?
Your lungs mature when you are around 20–25 years old. Total lung capacity — the maximum amount of air your lungs can hold — is roughly 6 litres in a healthy adult. From around age 35, lung function begins to decline gradually.
If you don't have a lung condition, most of these changes come from cardiovascular and muscular changes rather than from the lungs themselves. The physiological changes associated with ageing include:
- Alveoli (the tiny air sacs) losing elasticity
- Weakening of the diaphragm, the muscle that separates the chest cavity from the abdomen and drives most of your breathing — particularly noticeable during physical activity
- Structural changes in the ribcage bones, limiting how much the ribcage can expand and contract
- Reduced nerve sensitivity in the airways, making the lungs less efficient at clearing foreign particles
- A less robust immune response, increasing susceptibility to infections such as flu and pneumonia
Together these can mean more breathlessness on exertion, more fatigue, and a higher risk of respiratory infection.
What Can You Do For Your Lung Health?
The things that genuinely protect lung function are unglamorous and well established:
- Don't smoke. Smoking damages lung tissue and accelerates every age-related change listed above. This is by far the largest single factor, and quitting helps at any age.
- Reduce your exposure to air pollution, indoors and out.
- Stay active. Regular exercise strengthens the muscles involved in breathing and improves how efficiently your body uses oxygen. Aerobic exercise is one of the few things shown to improve breathlessness over time.
- Manage your weight. Excess abdominal fat physically limits how fully the diaphragm can expand the lungs.
- Get vaccinated against flu and pneumonia if your doctor recommends it — respiratory infections do lasting damage.
- Don't spend long periods lying down during illness or recovery if you can avoid it. Prolonged bed rest allows secretions to pool and reduces how fully you ventilate the lower parts of your lungs.
Where Does EWOT Fit?
Exercise With Oxygen Therapy is the practice of breathing a higher concentration of oxygen while exercising. It's worth being precise about what that does and doesn't do, because there's a lot of overstated information online.
What EWOT doesn't do
EWOT does not increase your lung capacity. Lung capacity is set by the physical size of your lungs and ribcage. No breathing practice or oxygen therapy enlarges them.
EWOT does not make your blood carry more oxygen. Oxygen is carried by haemoglobin in your red blood cells, and in healthy lungs that haemoglobin is already around 97–98% saturated when you're breathing ordinary air. Breathing a richer mix adds only a small amount of oxygen dissolved in the plasma. The idea that EWOT "helps your blood carry more oxygen" is one of the most common misunderstandings in this field.
EWOT does not improve lung function or repair lung tissue. It doesn't reverse the age-related changes described above.
What exercise does do
The benefits people experience from EWOT come primarily from the exercise. Regular aerobic exercise strengthens the respiratory muscles, improves cardiovascular efficiency, and reduces how breathless you feel at a given level of effort. Those are real, well-evidenced benefits — and they're available from exercise with or without supplemental oxygen.
Research on training with elevated oxygen in healthy people has found improvements in exercise performance and VO₂ max (systematic review of hyperoxic training, 2019; Richardson et al., 1999). That same review notes its own caution about long-term high-oxygen exposure, which is worth knowing alongside the finding. Those studies are about athletic performance in healthy people — not about treating lungs that are unwell.
If you enjoy EWOT and it gets you exercising consistently, that consistency is doing real good. Just be clear about which part is doing the work.
If You Have a Diagnosed Lung Condition
EWOT is not a treatment for asthma, COPD, pulmonary fibrosis or any other respiratory condition, and we don't sell it as one. It's intended for people without a diagnosed lung disease.
There are specific reasons this matters, and they're not legal formalities:
- In COPD, oxygen is prescribed and monitored for a reason. In some people with COPD, too much supplemental oxygen can raise carbon dioxide levels in the blood — a genuinely dangerous situation. Oxygen for COPD is dosed by a clinician, not self-administered at whatever flow a home system delivers.
- In asthma, exercise is itself a common trigger. Exercise-induced bronchoconstriction is well recognised. Any new exercise programme should be discussed with whoever manages your asthma, and your reliever inhaler should be accessible.
- Pulmonary fibrosis is a progressive scarring disease managed by a respiratory specialist, often including prescribed oxygen and pulmonary rehabilitation. Nothing available to buy online slows it.
Supervised pulmonary rehabilitation — structured exercise plus education, delivered by respiratory professionals — is the intervention with real evidence behind it for people with chronic lung disease. If you have a lung condition and want to exercise more, ask your doctor about a pulmonary rehab programme. It's the thing that works, and it's often underused.
How Often Should You Do EWOT?
For healthy adults, the usual approach is a 15-minute session, up to once a day.
Start more conservatively than you think you need to — around three days a week — and pay attention to how your body responds before building up. Tailor the intensity to your own fitness level.
Use stationary equipment that doesn't involve excessive head movement: a treadmill, recumbent bike, elliptical machine or stationary bike all work well.
Before You Begin
- Talk to your doctor first if you have asthma, COPD, any other lung condition, a heart condition, or you're unsure whether vigorous exercise is appropriate for you.
- Follow the equipment guidelines. Oxygen equipment needs sensible handling — keep it away from open flames, heat sources and smoking, and follow the manufacturer's instructions for your concentrator and reservoir bag.
- Start low and go slow. Build duration and intensity gradually, as you would with any new exercise routine.
- Listen to your body. If you feel dizzy, unwell or notice anything unusual during a session, stop. Pushing through pain or discomfort is not useful.
- Seek medical attention if symptoms are severe or persistent. Breathlessness that's new, worsening, or happening at rest is a reason to see a doctor, not a reason to exercise harder.
Frequently Asked Questions
Does EWOT increase lung capacity?
No. Lung capacity is determined by the physical dimensions of your lungs and ribcage, and no oxygen therapy or breathing practice increases it. Exercise can improve how efficiently you use the capacity you have, and how breathless you feel at a given effort — which is a different and more achievable thing.
Can EWOT treat asthma or COPD?
No. Neither condition is treated by EWOT. Both are managed with prescribed medication and, where appropriate, supervised pulmonary rehabilitation. If you have either condition, talk to your doctor before starting any new exercise programme.
Does breathing extra oxygen improve lung function?
Not in healthy lungs. Your blood is already close to fully saturated with oxygen when you breathe ordinary air, so the limiting factor isn't how much oxygen is available — it's how well your heart, circulation and muscles use it. That's what exercise improves.
Is EWOT safe?
For healthy adults who follow the equipment guidelines and build up sensibly, EWOT is generally well tolerated. No exercise programme is risk-free for everyone, which is why anyone with a heart or lung condition, or who has been inactive for a long time, should check with a doctor first. Oxygen equipment also needs careful handling around any source of ignition.
What actually helps my lungs as I get older?
Not smoking, staying physically active, keeping your weight in a healthy range, reducing exposure to air pollution, and staying up to date with respiratory vaccinations. These are modest-sounding and genuinely effective.
Key Takeaways
- Lung function declines gradually from around age 35, mostly through muscular and structural changes rather than damage to the lungs themselves
- Not smoking and staying active are the two highest-impact things you can do
- EWOT does not increase lung capacity, improve lung function or make your blood carry more oxygen — the benefits come from the exercise
- EWOT is not a treatment for asthma, COPD or pulmonary fibrosis, and is intended for people without a diagnosed lung condition
- If you have a lung condition and want to exercise, ask your doctor about pulmonary rehabilitation
A Note on Medical Advice
This article is for general education. It is not medical advice, a diagnosis or a treatment plan. If you have a lung condition, or you're experiencing breathlessness, cough or chest symptoms, see a doctor — and don't change any part of your prescribed treatment based on what you read here.
