Breathe easier with asthma in just minutes a day.
Breathe Easier, Train Your Lungs for Better Living. The O2 Trainer uses gentle, controlled inspiratory resistance to strengthen your diaphragm and intercostal muscles — the same muscles that work overtime during an asthma flare.
Bas Rutten
Former UFC Heavyweight Champion · Creator of O2 Trainer
Drug-Free Relief
No medication or propellants — train the muscles that power every breath.
View asthma benefits10 Minutes a Day
Short daily sessions are enough to feel noticeable changes within weeks.
View asthma benefitsBacked by Science
Inspiratory muscle training is widely used in pulmonary rehab worldwide.
View asthma benefits30-Day Guarantee
Try it risk-free. Don't feel a difference? Send it back for a full refund.
View asthma benefits
Train the muscles your lungs rely on.
Asthma narrows your airways, forcing your respiratory muscles to work harder for every breath. The O2 Trainer applies controlled inspiratory resistance — like resistance training for your breathing — so those muscles become stronger, more efficient, and less prone to fatigue when it matters most.
- Strengthens the diaphragm — your primary breathing muscle
- Trains the intercostals that work overtime during a flare
- Improves CO₂ tolerance so panic-breathing happens less often
- Helps reduce day-to-day reliance on rescue inhalers
Real benefits people with asthma notice.
Fewer breathless moments
Climb stairs, carry groceries, and play with the kids without gasping for air.
Less inhaler reliance
Many users reach for their rescue inhaler noticeably less after consistent training.
Deeper, calmer sleep
Stronger nighttime breathing means fewer wake-ups and better recovery.
Confidence to exercise
Get back to workouts and sports you've been avoiding because of your lungs.
Better breathing pattern
Retrain shallow, anxious breaths into slow, full, controlled ones.
Portable & travel-ready
Pocket-sized, no batteries, no app required — train anywhere in 10 minutes.
Three steps to stronger lungs.
Set the resistance
Twist the cap to choose a resistance level that matches your current breathing strength.
Inhale for 10 minutes
Breathe in against the resistance through the mouthpiece. Just two short sessions per day.
Track your progress
Increase resistance as your diaphragm strengthens. Most users feel changes in 2–4 weeks.
"I designed the O2 Trainer to make breathing muscles stronger — for fighters, athletes, and anyone who's ever felt their lungs hold them back. Asthma is no exception."
— Bas Rutten · Former UFC Heavyweight Champion
"In 2011 I made the O2 Trainer and I started using it. Three weeks later I didn't need my inhaler anymore."
— Bas Rutten · Former UFC Heavyweight Champion
Stories from people who breathe easier now.
"After six weeks I noticed I wasn't reaching for my inhaler on my morning walks anymore. That alone is worth it."
Megan T.
Asthmatic since childhood
"I can finally finish a 5K without that scary tight-chest feeling halfway through. Game changer for my training."
David R.
Runs with exercise-induced asthma
"Sleeping better, breathing slower, less anxious about flare-ups. Ten minutes a day is honestly nothing."
Priya S.
Mild persistent asthma
"Love it! I find myself breathing differently in everyday activities without thinking about it now. My wind has already improved after a couple of weeks. Thanks Bas!"
Gregg G.
Verified buyer
"I'm very pleased with the O2 Trainer. I started at a low intensity and increased it gradually. I use it morning and night for a few minutes of deep breathing."
Joe F.
Daily user
"I used a similar device in my 20s and I know it works for building the muscles for your lungs. Now going on 66, I decided to incorporate one again."
Daniel W.
Age 66
"It's a big improvement from the last one. I use it every morning — sturdier and more comfortable. Really helps with my running and other cardio."
Scott R.
Runner
"Strengthening my lungs every day thanks to Bas. The product is designed well, functions like I expected, and it's definitely not a placebo."
Jesse D.
Verified buyer
"I've studied and practiced a lot of breathwork and various modalities for developing effective breathing. This might be the single most effective tool of them all."
Anonymous
Breathwork practitioner
Questions, answered.
Start breathing easier today.
Join thousands of asthmatics, athletes, and everyday breathers who train their lungs with the O2 Trainer. Ten minutes a day. Drug-free. Backed by a 30-day guarantee.