Learn how table-tennis spin works from nine short hands-on lessons with a 3D ball you can turn

Each lesson pairs a spinning 3D ball with a short explanation, a practice tip and a quick knowledge check. It covers topspin, backspin, sidespin, ball flight and how to read an opponent's spin.

Notes

The page itself doesn't mention AI; the maker says in the HN thread he prompted LLMs and iterated on the physics, and has a blog post about it. Physics is simplified.