Blowing up hot water bottles

[beezwax]

Hey guys, does anyone know the deal with blowing up hot water bottles?
Is this a genetic thing or a cardiovascular training thing?

I remember seeing franco columbo do it a long time ago. But now im seeing skinny girls on youtube doing it.
I tried and it was ridiculous. I couldnt get one breath inside. Mine is probably 30 years old and quite thick.

Some of the ones ive seen on youtube kinda seem thinner. Like dollarstore hot water bottles. Theres a cheap looking green one.

They also do this for the guinness book of world records and the people dont seem like fitness junkies.

Anyone have any experience? Learned to do it with cardio training?

I just imagine that if you can do this, you must have hulk lungs, and that'd go a long way in helping you train, as well as run. (Like infinite oxygen available)

Ive looked it up but cant find any info at all really.

 

[appleton111]

girls blowing hot water bottles?
following!

 

[Milton]

I've known deep free divers who do it when they are in training for deep dive competitions. great for the lungs as it expands the lung air capacity. Big wave surfers too so they can hold their breath longer when their rolling in the big wave breaks.