There's another basic exercise which i want to add. Many animals make noises to affirm their territory, but what i am going to suggest is something which is an internal self confirming sound, The animal equivalents aren't so relevant here because maybe it's only appropriate for human vocal chords. I find it is ritualised by Buddhist monks droning their texts. This is far simpler. Humming quietly to yourself. At a stretch of the imagination maybe cats do something similar when they purr, hens can make a similar sound, camels and maybe even frogs!
This is something else we can do on the out breath while practicing broadband scenting on the in-breath. It is a sidetrack from the central theme of the essay but the possibility comes naturally with our human body.
I find it a useful way of keeping peace with myself particularly when everything outside is too noisy, busy and overpowering, like when walking through a crowds of bustling people.
At birth, when the breathing starts, we start smelling and we start making noises with our mouth.
If first you sense taste, from the lips and mouth down into the body; then sense the smells in and above the roof and sides of the mouth. Then feel how the soft palate is the centre of this area - and notice how when you start humming and it vibrates this central area, (and also the top and back of the throat). This stimulates the lower brain. It's quick and easy fun, and can harm no-one.
Sometimes you may feel the humming, vibrating in your belly, i don't know the next step on that route. But it's easy to feel it in the soft palate and the top of the throat, and it's relaxing. You can also focus this humming and vibrating anywhere stiff in the body. Quite generally it seems healthy to allow yourself to make any sort of vocal noise you want, to vibrate and massage yourself inwardly.