Even mermaids would like to try out aerial hoop. 

After the girl in the striped leggings was done with her hoop session, she left, leaving the hoop behind. A mermaid came along and thought: “That looks like fun. I want to try it”. Her pet octopus was everything but excited about the idea and tried to get away.

I am not sure why all the water inspired illustrations. But there is actually a pose called inside / outside mermaid in aerial hoop.