Here is another warm-up exercise. The melody somehow reminds me of An den Wassern zu Babel by Pärt. In this exercise singers will learn to distinguish between ascending and descending fourths and fifths.
To start with, sing the following melody, in which the jumps are getting bigger each time:
Next sing this mirrored melody:
Now we will combine the melodies:
Finally, sing this melody in canon, for example by letting the women start en letting the men enter after two beats. In that case there will be a lot of thirds between the parts:
The exercise will sound like this: