That’s what one of my fellow kickboxing classmates said to me when we were working on a partner ab exercise. Thanks!
Person A lies down, feet up in the air while person B stands above A near their head. A holds into B’s ankles while B pushes hard on A’s feet. A’s job is to keep legs straight and in place. And if not A must use their core muscles to pull the legs back in place.
Does that make any sense?
For a much better description go to this link and scroll down to “Throw Downs.”