Hello everyone.
as anyone already been using this toy for training: http://www.ultrabreathe.com/ubintro.htm
It looks like it makes your respiratory muscles stronger.
I am wondering if that can also increase your maximum lung volume.
Do you think this would be any good for freediving?
as anyone already been using this toy for training: http://www.ultrabreathe.com/ubintro.htm
It looks like it makes your respiratory muscles stronger.
I am wondering if that can also increase your maximum lung volume.
Do you think this would be any good for freediving?