SOVT (semi-occluded vocal tract) exercises are vocal warm ups that involve narrowing at some point in the vocal tract, for example the mouth being partially closed during sound production.
Due to the mouth space being reduced, some of the airflow that travels from the lungs reflects at the lips and goes back down to the vocal folds. This back pressure helps to counter the pressure below the vocal folds, which in turn helps them vibrate more evenly with reduced tension and much less effort. This makes SOVT exercises, the best and safest vocal warm ups for singers and speakers.
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https://www.voiceaffairs.com/how-to-sing-we-praise-you-bethel-matt-redman/