Hi,
https://www.openstreetmap.org/way/1153936122
looks like an outdoor arena on bing,
https://www.openstreetmap.org/way/1153936123
looks like a round pen.
Arenas and round pens are usually tagged leisure=pitch + sport=equestrian and not leisure=horse_riding; compare
https://wiki.openstreetmap.org/wiki/Tag:leisure%3Dhorse_riding
I don't know what https://www.openstreetmap.org/way/1153938136 is. Is it an arena too?