The way you start a note (the "onset") sets the stage for everything that follows. If you start breathy, you'll likely stay breathy. If you start with a harsh grunt, you'll introduce tension.
This exercise focuses on the Glottal Onset. While we often try to avoid hard glottal attacks in smooth singing, practicing gentle glottal stops is a powerful way to wake up the muscles responsible for bringing your vocal cords together (adduction). Think of it as a tiny bench press for your voice.
Actionable Step: Glottal Repeats
The goal here is precision, not force. You are looking for a clean, crisp start to the sound.
1. The Sound
Use a clear, open vowel like "Ah" or "Uh".
2. The Feel
Feel a tiny "click" or distinct tap in your larynx at the start of each note. It should feel like the sound you make when you say "Uh-oh!", but lighter. Don't grunt. If it hurts or feels scratchy, you are pushing too hard.
3. The Drill
You will sing the same note four times. Between each note, completely stop the sound (and the air) for a split second. This silence is just as important as the sound.
Practice with Vocal Driller
Keep the tempo moderate. Focus on making all four onsets sound identical in volume and clarity.
Why This Works
This exercise relies on the scientific principle of adductor training. By using gentle glottal stops, you are isolating and engaging the lateral cricoarytenoid (LCA) and interarytenoid (IA) muscles. These are the primary muscles responsible for closing the glottis. Repetitive, clean closure trains these muscles to act efficiently, eliminating breathiness ("hypofunction") without introducing the strain of a hard attack ("hyperfunction").