One of the reasons I’ve been considering offering early childhood music classes is because I am a firm believer in the strong relationship between music and movement. As an undergrad, I took two semester of Dalcroze Eurhythmics which I found incredibly useful. We learned movements that fit different meters and learned to respond expressively to music through our movements. I think students would have a much easier time developing a good sense of beat and rhythm if they could learn it naturally through movement. Even complex concepts such as 3 against 2 seem more natural when approached through movement rather than a purely theoretical approach.
Besides, movement is fun! =)