Further reading on this topic
Dr Laura Cirelli and her colleagues carried out the research study that found a link between bouncing toddlers in syncrony and their helping behaviour. In this video, the researchers explain more about their research: https://youtu.be/IaqWehfDm7c
Research has shown that babies not only detect rythm from birth, but they also move in time to music from a very ealy age. Read more about this fascinating topic in this article.
Research on adults has also documented the effects on moving in syncrony on social bonds. To read an overview of research on this fascinating topic, see this article in the Scientific American magazine.