Yoga or Yogurt

i teach Yoga tonight ..every wednesday PM and saturday AM... it's an interesting mix of people and without the use of proper mats we use the fake (think Chinese) straw mats to cover the swept but dirty floor. People keep coming back sooo at least a few like what we are doing. What becomes the challenge is to keep the class interesting for everyone ... some people have NEVER done yoga B/4 or some have never, ever; even touched their toes.... others are like Gumbi and can be a pretzel on demand.
It's mostly a volunteer group but, Amazingly enough a few Tongans have come ... it's hard to get them to be repeaters ... however, if i have learned anything about Tonga; it's just to "wait" ... things happen at a pace unfamiliar to the western mind.
What with eating being a national sport here ... if i offered yogurt after yoga ( ya gotta get them to stay to the end) i have a feeling the class size would double !!!!