Player To Be Named Later said:

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Ok, thanks for the info. I guess the Elevation Masks are just a lot better for endurance/cardio training for football/etc?

My old ass ain't putting one on regardless

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The issue with the elevation masks is there's some that swear by them, but others say that they are a gimmick. I've never used one so I cannot say but I don't have to train for that and it gives me no real advantage. That said, if I were a triathlete and had a triathlon in high altitude, I would consider them for sure.