"what i dont understand about this product when linked to sport is that no sportsperson when under the exertion of any sport breaths through their nose"
Who says ???
"...and i cant imagine many thumping around centenial park , panting away, would want a piece of expanding plastic shoved up their durante would either"
- you won't need to imagine Dott, because as per your posts you have no stock held or visible sentiment!!