Hi,
https://www.openstreetmap.org/way/1346238336 does not look like a horse riding centre on bing. It looks like an outdoor riding arena and should be tagged like https://www.openstreetmap.org/way/1230058171 (pitch + equestrian). In JOSM you can use the preset for sport=equestrian to tag it. See also: https://wiki.openstreetmap.org/wiki/Tag:leisure=horse_riding