Goat Yoga!

So I saw a youtube video on goat yoga. Is this only possible with Nigerian Dwarf goats, or would other mini goats be okay? I guess if it's just with kids (goat kids) then it wouldn't really matter. I'm a personal trainer and used to teach group yoga classes. If this really is a thing I think I'm going to start teaching yoga again once I get my goats and have some kids on the ground.
Has anyone gone to one of these classes in real life? Anyone see them first hand? What kind of registration, insurance, liability waiver etc is required?