When was the last time you saw a child really excited about something? They jump up and down and wave their arms and run around. Movement is a natural response for children (source). After all, we learn by doing, acting, observing, experimenting, and feeling. This is especially important to remember when teaching children to sing. Singing is a full-body activity (source) and movement invites children to connect and engage with music in a whole new way.
Use movement activities in your choir rehearsal to help develop critical listening skills, that all-important sense of steady beat, responsiveness, discernment, sensitivity to phrase-shaping and other elements of music expression, inner hearing, understanding of harmony and tension-release, and musicality. Movement also helps children develop coordination skills and connects eye and ear and body and mind.