Review on Enhance Performance with VIKINGSTRENGTH 3. Generation VO2 Workout Mask for Running Biking MMA Endurance by Adam Nelson

Not the easiest setup for various limitations. Pretty easy to swap out and put together, but feels like it's either very easy to breathe or very heavy. This. the claim of many different altitude simulations is rather unfounded. I lived at 3200 and 7500 feet for several years each. You can get 3000 from a COVID mask or a pollution run mask. For the 700 feel, I couldn't find a combo that looked like it. It appears to be 10,000 or more. The manufacturer suggests leaving the setting as is, but adding two breaths and adding one or two just for the exhale. Spinning a bubble is useless as the exhalation is not limited in height. Difficult to breathe in through just one and it works with both inlet and outlet filters to blow the mask off your face etc. For $25 it's ok but I'd rather spend 35-40 and the best product to get. . The silicone nose piece started to bother me after about 3 miles and I use it on runs up to 8-10 miles.