The O2Trainer 2.0

I haven’t used it long enough to see much difference but it is a quality built product I can really feel the work on my intercostal muscles after a session.

I recently just purchased your product. And was surprised how sore my back got in parts I didn't know or realize was responsible for helping me breathe. I'm on a level six I haven't done much of the special exercises, just regular breathing, making sure I don't pick up my shoulders or flex out my throat lol i think it's a good product happy. I got it thank you

Still early but so far it’s pretty awesome! I’ve been using it a a pre workout primer to get the systems going.