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"Training masks are facial masks worn to limit the intake of air during breathing. Their ostensible purpose is to strengthen the respiratory musculature by making it work harder." -- Wikipedia I wondered too. I thought it might be some sort of SandM thing...
Sorry, there was a problem. Please try again later.I had the same question... Googled it. Here's some info: https://www.trainingmask.com/pages/the-science
Sorry, there was a problem. Please try again later.Agree, WHAT'S IF FOR??? ...while working out under (upcoming) Gov. Lockdowns???
Sorry, there was a problem. Please try again later.It’s part of the Darth Vader transformation kit
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