The O2Trainer 2.0

Great! Love the adjustability! As a scuba diver it is a great exercise for breathing through a regulator. Conserving air means more bottom time!!! I recommend it!

It's a tough work put but at my age 67 I wish I had one of these back in my 20s iv studied n train in MMAEVEN BACK B4 UFC SO IM WORKING IT N LOVE THE BREATH WORKOUTS

Product arrived in perfect condition works great and came with an added extra gift for a shipping error that wasn’t even their fault! Very happy with the product and customer service. Earmarks of a great company with a long future. Thank you🙏