Squeeze. The First Approach

One fine rainy Sunday, Rita stopped lying to herself: she went outside, saw a strange bicycle, got on it and went to the nearest sports club, see what was there and how. It's time to lose weight. Going down into the hitherto unknown dungeon, Rita found herself in a strange world with its rules and heroes. What happened to Margarita there, underground, and was she able to get out into the sunlit world?