Glide on a lip trill across a major sixth.
Why this matters: a smooth glide is what carries the voice across a register break. On a lip trill, the airflow does the work and the larynx stays free — practicing the ascent here builds the gesture you’ll need on real vowels later.
8 trials. Lip-trill from a low comfortable pitch up across roughly 9 semitones (a major sixth) without breaks. Hit 5 to pass.