Tränare för magandning Smal bantning i midja och ansiktsminskning

Complies with the description. Very useful for improving your respiratory capacity, working your breathing at the same time as your abs and helping you expectorate if you have lung health concerns.

The resistance can be adjusted. I have a small lung volume, so I have to do exercises. It's great for that. I cut out the white one in the middle. Otherwise I'll get vomit

I received my little whistle I want to see if it works to lose pounds thank you very much.joom

Would be nice if there was some instructions, arrived in good order.