VOICE TIP: Blow Into a Straw to Exercise (and Avoid Losing) Your Voice. “As news site Vox explains, blowing into a straw is one type of what’s known as semi-occluded vocal tract exercises. These exercises help stretch your vocal cords. This is useful for warming up before a speech or singing, but it’s also helpful if you’re losing your voice.”
More on the story here. Video below.