Reining

a Western style of pony play where the trainer guides the horses through a precise pattern of circles, spins, and stops at the lope or gallop. It’s the Western equivalent of Dressage. The pony and trainer perform a demanding pattern of movement as a team without obvious aids.

*taken from - The Human Pony: A Handbook for Owners, Trainers and Admirers found at http://www.greenerypress.com/