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Russians have been doing something similar for a long time. I've seen videos of them using a straw to breathe through for the same benefit (as PedOncoDoc alluded to) with 1/10th cost. I have to agree with Dozer though, the overall benefit from running hills, especially with a vest on, far outweigh using a mask, especially since the hill running is training for real world scenarios.
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Ut Prosim
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