"Thank you, Ruby, I'm glad you thought of it." The coach of the monotail swim team said. Since the beginning, Ruby had swam competitions or other things like shows or videos for them. The thing that made it so challenging was that monotail meant you had a mermaid tail during it. The monotail itself was simply the bottom of a mermaid tail(not a real one, though, its often made out of silicone) that you could put your feet in.