"Thanks for the ab workout!"
Also heard from students during class were:
As she was learning the pole slide trick: "Wow! How fun is this?"
Another learning a new pole trick: "This feels good!"
From another as she left class: "Thank you that was fun."
And my favorite, because it was the first day that I taught this group how to walk in 6 inch platform heels: "When we put on these shoes, we're like instant stripper!"