Find the resonance of any room:
1️⃣ Start with vocal slides on any vowel (Oo usually is a good start)
2️⃣ Go slow as you climb up and pitch and listen for when the vibration naturally amplifies in volume
3️⃣ Play around with the width and height of your mouth opening to maximize the resonant frequency
4️⃣ Sing and sustain that pitch and feel the vibrations around you!