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What People Are Saying About the O2 Trainer- Amazon

December 08, 2018 2 min read

The Bas Rutten O2 trainer is designed to increase endurance by simulating high altitude. It can be used for most exercises and activities, including weight training, running and, of course, rock climbing. It works by teaching your lungs to perform with less oxygen and get as much as possible from each breath, and can be used at any performance level.

The O2 trainer improves lung capacity and increases red blood cell levels. It also decreases your maximum heart rate for the same amount of work and helps your blood unload oxygen more efficiently. It works very simply, by controlling the air intake to the lungs. Your lungs have to work harder to pull in the same amount of air. As you get used to it you can add the included nose clip to work your lungs even harder.


Customers and athletes love the O2. It’s made of high grade polymer and constructed in a high quality manner. In fact, one customer said it was the only trainer he had found that also worked his diaphragm whilst being half the size of a normal altitude training mask.

Here is what people are saying on Amazon:

  • I bought the Bas Rutten O2 trainer instead of the high altitude trainer. I am very impressed! This O2 trainer is very high quality. The unit is made of a high grade polymer coated in a biodegradable rubber housing. The mouthpiece is sort of a snorkel or scuba design and is very durable. There are two ways to use the O2 trainer: with your workout or with breathing exercises. The trainer has an intake on the right and an expeller on the left. The intake can be adjusted with different size diaphragm screens. Workout screens are 14mm through 5mm; breathing exercise screens are 4mm through 1mm (very challenging). Bas has an online tutorial on his website that explains everything about the trainer: how to change the screens, what workouts to do when using the trainer, ect. This is the only trainer I have found that works your diaphragm as well as increasing your lung capacity and anaerobic endurance. The entire case is less than half the size of a high altitude training mask and fits nicely in a book bag or gym bag. The shipping is very prompt; I had it in 4 days. Deserves six stars but I can give it only five!