Get them to Shake Their Sillies Out. It's a song. You can download it free. Go online and look for other children's songs that have movement; e.g., Going on a Bear Hunt; Ring-Around-the-Roses, B-I-N-G-O, and so on. There are a ton available. Learn chants and fingerplays. Especially the latter. They can calm the most monstrous crowd of 5 year olds. One that worked for me was 'Grandmother's Glasses'.
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All the best.