RE: Ensayos con la técnica de Lax Vox - Esp/Eng
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Cool. There was a device, given to my sister during her baby delivery time when her lungs were weak, to blow air and keep a ball floating. This reminded me of that.
My son just started to blow air out of his mouth. It will be fun to do such activities at home as well.
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Perhaps they share the same principle of seeking to renew the diaphragm area. I recommend you research this further; I'm sure you'll find it useful.