The attack of sound happens during exhalation and it has to be as natural as possible, like in speaking. Vowels have to be anticipated with an aspirated H.
You have to be very relaxed (neck muscles, shoulders, jaw, etc.) and, even during inhalation, put your jaw in yawning position, opening it at the cheekbones level (fig. 4A/4B/4C). Women will shape the mouth as if they were smiling (fig. 5/5A), men will move the lips forward (fig.5B).
The tongue and the jaw go backwards, the larynx goes down and the palate rises, as it happens in yawning. This creates an arch that channels the sound. Push the air between the soft and the hard palate to emit the sound, expel the air from the nose and imagine it as if it was dark (fig.6/6A). Project the air vertically and clockwise.
Everything has to happen as naturally as possible. Don’t lower the velum palatinum too much, or the sound will result nasal. Articulate on the lips with visible molars. At the beginning, try putting your fingers on the cheeks, just under the cheekbones, and push the cheekbones up (fig. 4A and 4B).