Start small and personal rather than broad. The most effective opening line is simply: "I tried this and thought of you."
A few things that make the introduction land better:
Show them a short video rather than describing it — Pungra is easier to understand seen than explained
Invite one or two people at a time before trying to organise a bigger group
Emphasise what it gives them personally (a workout that doesn't feel like a chore, culturally familiar music) rather than leading with statistics or health messaging
Don't oversell it as a performance opportunity — set the expectation that it's exercise, not a show