It's been done..
I believe most of the units have at one time gone through Mask PT. Only value to wearing a mast for training I found was learning to Shoot with it.
Running get you Sweat, foggy lenses, and a need for breath.
Don't need a mast to restrict breathing while running. Start with a hospital mask or two to restrict breathing and learn what speed you can maintain for a good distance.
my two cents ...
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Thomas Jefferson
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