Sustain a steady straw or lip-trill for 6 seconds.
Why this matters: semi-occluded vocal tract (SOVT) exercises — straw phonation, lip trills — balance airflow against vocal-fold resistance, which is what stabilizes pitch. A clean sustained SOVT means the rest of your singing has somewhere steady to start from.
5 trials. Each: pick a comfortable pitch and hold a lip trill (or straw phonation) for 6 seconds with pitch SD ≤ 25¢. Hit 5 of 5 to pass.