Hi Marco, I think this is a great idea, and while raising money from pop-up events in parks, etc. would be a great idea, as well, I think charity events would promote exercise and thus improve the health of individuals who typically wouldn't pay -- or afford to pay -- for yoga.
I love your idea the best and I hope this could really work out. Have you tested the safety with the bench scale tests and prototypes? Would it be beneficial to expand your ideas to aquariums, as well?