Gently hold the tongue tip between your teeth while turning your head from side to side. Keep doing both as you change the larynx height to control three different tone colors.

Gently hold the tongue tip between your teeth and say “eh” without letting sound escape through your nose. This is the reference larynx height for this exercise.

Compared with normal-height Goo “eh”, create a wider space from mouth to throat, like a large tube, and say “eh”. Aim for a deep, thick giant’s voice, as if you were about one meter taller. Keep the tongue tip against the back of the lower front teeth.

In contrast to the deep lowered-larynx Goo “eh”, make a piercing, bright voice like a tiny person only a few tens of centimeters tall. Keep the tongue tip gently held outside the mouth and lift the tongue toward the palate as far back as its base, narrowing the space as much as possible. Say “eh” in this position; avoiding sound leakage through the nose is even better. This is harder than before, so do not raise the volume too much or retract the tongue so strongly that it slips free of your teeth.

Try another exercise that interests you, or a singing exercise—anything that sparks even a little curiosity. Every exercise helps reduce unwanted movements in some parts, so the benefits will eventually feed back into this one. If you force yourself to continue but discover nothing enjoyable, the exercise may not fit your current level: you may need other experience or information to understand and perform it. Once you gain that, your interest can return naturally. Until then, follow the exercises that interest you!