O2Trainer Breathing Muscle Trainer by Bas Rutten
Breathing muscle trainer to strengthen diaphragm and intercostals for improved lung capacity and endurance. Includes 16 interchangeable intake caps for adjustable resistance; praised for effectiveness and ease of use by users
Highlights
- 16 adjustable resistance caps
- diaphragm and intercostal muscle training
- endorsed by Bas Rutten and used for performance
Pros
- adjustable air resistance with 16 caps
- builds diaphragm and breathing muscle strength
- user-reported improved breathing capacity and endurance
- familiar brand with UFC athlete basis
- compact, portable training device
Cons
- mixed reviews on comfort and value for money
- some users find it uncomfortable
Best For
Features
- Designed by UFC legend Bas Rutten for diaphragmatic breathing training
- 16 interchangeable intake caps enable progressive air resistance
- Strengthens breathing muscles for expanded lung capacity and endurance
- Compact, portable, and travel-ready—no batteries or apps required