This warmup serves many purposes:
- teaching a 4/4 conducting pattern
- establishing strong and weak beats in the voice and body
- keeping a steady beat (and an independent part, once you're trying this in canon!)
- destabilizing the major scale so that the ear has to hear larger and larger intervals
.. it's also fun! Once your singers have mastered this, since it in up to 4 parts (beat 4 is the hardest, of course!), and then have them walk in mixed formation, trying to maintain their part.