If you like yoga and you like word puzzles, you might like these products. The puzzles are based on BKS Iyengar's books and teachings and you'd better know your Sanskrit or be prepared to learn some. From the home page:

Whether you are a teacher studying to improve your Sanskrit spelling and vocabulary, or a student just wondering what in the world these words mean, these books will provide you with a few hours of exploration and discovery and definitely some good activity for your brain cells.