Not sure about power breathe, infact I dunno what one is but I can assure you on several occasions I have blown out of my arrse on PT maybe its similar :D
In short yes they do, however you have to use it consitently and over a period of time to notice any real benefits.

Go for the Powerbreathe Classic Red or the Ironman.
Used it for building an a area localised injury, they gave me the blue one ( athletes ?...what the hell ).

It does work, and I never believed before using this that your lungs/lung muscles? could actually ache....strange sensation deep in your chest.
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