If humans collect into tribes, then ceremonies and rituals force tribes to process change. Acceptance of tribal change must be acknowledged by the group formally to break through resistance in the hearts of the members. Ceremonies provide a script for forcing such acceptance, and they help cement leadership decisions by providing positive and public social acceptance.
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The body of work studying martial arts practices is almost entirely junk science. Look at any study of martial arts that attempts to prove or disprove claims about its efficacy or determine how fast punches are, and you will find someone with a conflict of interest behind the research: a martial artist.