When you think of contortionists, images of circus performers (perhaps a la Cirque du Soleil) likely come to mind. The bending, twisting, and stretching seem impossible — and never fail to mesmerize.

The video follows Topper and Steven as they build a secret circus at home that must earn at least four stars from the world’s strictest circus teacher, Sir Snobby, or be shut down. They build a hidden ...