Hi,
Area 
https://www.openstreetmap.org/way/1443480197 is far too small to be an equestrian center; it is probably a lunging circle, and these are normally tagged like riding areas: leisure=pitch + sport=equestrian. In JOSM, you can do this with the preset for sport=equestrian. Compare https://wiki.openstreetmap.org/wiki/How_to_map_a#Riding_centre_(equestrian)