Just as the tile says: I'm moving my young mare to a barn with a small indoor in December. I'd love to hear your favourite (predominantly flatwork) exercises for when you're constricted by a small ring.
Good time to practice and teach things like turns on forehand, haunches, leg yields, etc. I play around with some dressage tests since they flow nicely and are designed for fairly small spaces. Lots of ground rail work in all kinds of configurations. We alos set up trail obstacles and play with them.