Riders and their horses of the Spanish Riding School of Vienna perform a dress rehearsal for the media at the SSE Arena in London

Riders and their horses of the Spanish Riding School of Vienna perform a dress rehearsal for the media at the SSE Arena in London, Britain November 10, 2016. REUTERS/Peter Nicholls

Riders and their horses of the Spanish Riding School of Vienna perform a dress rehearsal for the media at the SSE Arena in London, Britain November 10, 2016. REUTERS/Peter Nicholls