Matt S. answered 12/15/22
Experienced Vocal Coach: Fast Results
Humming for two minutes (with proper face and mouth shape, and proper vocal emphasis) will do more for a singer to warm their voice than 60 minutes of voice and singing exercises.
The main goal in warmup is to relax the vocal cords inside the larynx, quickly in a safe way without strain. Get those cords vibrating and moving, working like the muscles of the rest of the body!
I teach simple humming warmups in my lessons that anyone can do--no special music knowledge is required.