Magic Choral Trick #34 Warm Air
This one is so simple, so effective.
Ask the choir or chorus to sing a couple of phrases of a song. Listen (preferably without directing, so that you can really hear)
Now have the singers hold the palm of a hand up in front of the mouth – about three inches away from the face.
The only instruction now is to create a constant flow of warm air onto the palm of the hand. Fuller, richer, more blended sound.
By the way, I often ask a chorus member to come out and listen to the before and after stuff – just to be sure that it’s not wishful thinking on my part.
Also, the great thing about introducing this sort of physical action is that the director can ask everyone to use the technique without ever stopping the singing.