o2 trainer
Worth a lookShows a sweet-spot price point ($30.21 avg), but a concentrated shelf (top 5 take 73% of clicks) keeps it on the watch list.
Avg price
Incredible$30.21avg listing price — sweet spot $15–$100
Returns
Great1.7%return rate — above 5% kills the launch gate
Price range
Great$5.25–$57.42cheapest to priciest tracked listing — scored on the share inside $15–$100
Market size
Great$852K$852K/yr · 436K searches
Conversion
Good6.5%search→purchase rate — share of searches ending in a sale
Quality gap
Good4.4★avg incumbent rating — lower means beatable quality
Brand share
Okay80%top-5 brand share — brands hold most of the demand
Review moat
Okay2,250.38avg incumbent reviews — the moat a new listing must climb
Growth
Bad-0.7%90-day search growth — must beat 0% to launch
Competition
Bad73%top-5 click share — a locked-up shelf
According to Flapen's Amazon United States niche tracking, o2 trainer is a $852K/yr Amazon United States market (436K searches/yr). The top 5 brands hold 80% of demand. Demand peaks in Feb. Verdict: Worth a look — 55/100.
Data updated Jul 14, 2026 · scored weekly · How we score niches
o2 trainer market data
- Units sold / yr
- 25K–30K
- avg 2,000–2,500/product
- Revenue / yr
- $755K–$906K
- units × avg price
- Conversion rate
- 6.5%
- Avg BSR
- #218
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 69%
- Out of stock
- 0.0%
- Avg brand age
- 43 months
- Avg seller age
- 163 days
Competition & brand share
The top 5 products capture 73% of clicks — a locked-up shelf that new listings rarely crack.Brands
11 rising
Sellers
16
Top-5 brand share
80%
Top 20: 100%
Top-5 click share
73%
Top 20: 100%
Open market
15%
- Inhale39%
- O2Trainer16%
- Expand-A-Lung9%
- TEAWOO9%
- The Breather7%
- TyeinGo5%
- Open — no brand owns it (5 brands, 15%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -0.7% search growth over the last 90 days.Peak months: Feb · busiest ÷ quietest = 2.7×
Top o2 trainer search terms
- lung trainer148K/yr
- breathing trainer113K/yr
- breath trainer31K/yr
- vo2 max trainer15K/yr
- inspiratory muscle trainer11K/yr
- respiratory trainer16K/yr
- o2 trainer22K/yr
- bas rutten o2 trainer19K/yr
- ironlung5K/yr
- oxyfit8K/yr
Top o2 trainer products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 13 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Inhale Lung Trainer | Breathing Exercise Device for Lungs | Made in USA | Lung Exerciser Device | Breathing Trainer | Adjustable Resistance | Medical Grade Silicone Mouthpiece | Carrying Case included
Inhale$19.654.3★2,029 rev
Bas Rutten O2Trainer: Breathing Muscle Training Device | Lung Power & Endurance Tool for Athletes Singers & High-Altitude Performance | Diaphragmatic Respiratory Trainer | 16 Resistance Caps | Blue
O2Trainer$57.424.5★2,002 rev
EXPAND-A-LUNG | Breathing Exerciser Device for Lungs | Airflow Trainer Fitness | Cardio Expansion & Capacity | Sports Endurance | Dual-Way Inhale-Exhale Workout
Expand-A-Lung$16.174.3★2,522 rev
THE BREATHER Natural Breathing Exerciser Trainer For Drug-Free Respiratory Therapy Breathe Easier with Stronger Lungs Guided Mobile Training App Included
The Breather$50.414.4★9,132 rev
Breathing Exercise Device for Lungs Lung Exerciser Device 5000ml Volumetric Deep Breathing Trainer with Flow Rate Indicator for Respiratory Health & Recovery
TyeinGo$24.354.6★1,178 rev
Newest
by launch date
Portable Lung Capacity & Ab Trainer - Adjustable Resistance Breathing Exerciser for Core Strength Swimming Martial Arts | Medical-Grade Silicone Compact Design with Flow Control Valve (Black dots)
FANBODTA$5.2514 rev
OxyBio Oxy Respiratory Trainer | Breathe Easier with Stronger Lungs | Made with High Grade Silicone | Breathing Exercise Device for Lungs | Portable | Adjustable Resistance Settings | Black
OxyBio$24.76370 rev
Portable Breathing Trainer with Adjustable Resistance Settings for Enhanced Strength and Endurance Black
TEAWOO$6.19430 rev
3 PCS Portable Breathing Trainer with Adjustable Resistance Settings (Black/Grey/White)
TEAWOO$10.13430 rev
Bodyssey Breathing Trainer | Premium Silicone Trainer | Boost Breathing Patterns | Adjustable Resistance Levels | Compact Portable and Easy to Maintain (Black)
Bodyssey$38.2052 rev
Trending
90-day click momentum
TRAININGMASK 2.0 - Elevation Training Mask for High Altitude Endurance & Breathing Workouts - Ideal for Running & Cardio (Medium Blackout)
TRAININGMASK$41.794.3★
EXPAND-A-LUNG | Breathing Exerciser Device for Lungs | Airflow Trainer Fitness | Cardio Expansion & Capacity | Sports Endurance | Dual-Way Inhale-Exhale Workout
Expand-A-Lung$16.174.3★
Portable Lung Capacity & Ab Trainer - Adjustable Resistance Breathing Exerciser for Core Strength Swimming Martial Arts | Medical-Grade Silicone Compact Design with Flow Control Valve (Black dots)
FANBODTA$5.254.4★
Portable Breathing Trainer with Adjustable Resistance Settings for Enhanced Strength and Endurance Black
TEAWOO$6.194.3★
![Sparthos Workout Mask High Altitude Mask - Face Mask for Gym Training Work Out Running Cycling Elevation Cardio Fitness - Resistance o2 2 3 - Lung Breathing Exercise Mask Men Women [Black +Case]](https://m.media-amazon.com/images/I/41xrgJRetmL.jpg)
Sparthos Workout Mask High Altitude Mask - Face Mask for Gym Training Work Out Running Cycling Elevation Cardio Fitness - Resistance o2 2 3 - Lung Breathing Exercise Mask Men Women [Black +Case]
Sparthos$41.184.4★
What buyers say about o2 trainer
What buyers praise and complain about, mined from review topics.What buyers love
“Breath Well”
“Great build quality”
“easy to carry”
“which was very efficient”
“As advertised”
“Great value”
“It works to improve your lung capacity”
“Easy to rinse and reuse”
“its not too heavy”
“Great product to use after open heart surgery”
What buyers complain about
“bad instructions”
“Doesn't help me breathe better”
“Not Very Effective”
“Broke”
“A little overpriced”
“It didnt fit my face properly”
“Junk”
“Weak”
“I had blood clots in my lungs”
“It is very complicated and not helpful”
Top return reasons
Common questions
- Is o2 trainer profitable to sell on Amazon United States?
- The niche generates $852K/yr across 13 tracked products. 90-day search growth is -0.7%. Flapen's verdict: Worth a look (55/100).
- How competitive is the o2 trainer niche?
- 11 brands and 16 sellers compete. The top 5 products take 73% of clicks and top 5 brands hold 80% of demand.
- What do buyers complain about in o2 trainer?
- Top complaints mined from reviews: Instructions/User Manual/Troubleshooting, Breathability, Functionality-Overall. The return rate is 1.7%.
- When does demand for o2 trainer peak?
- Demand peaks in Feb; the busiest month runs 2.7× the quietest.
- What does it cost to enter the o2 trainer niche?
- Listings span $5.25–$57.42; the average listing price is $30.21 (sweet spot $15–$100). The average incumbent carries 2,250 reviews — the moat a new listing must climb.