If you want to build a road you level, water and compact, and that is exactly what a lot of riders do to their arena, and then
they wonder why their horse pulls up short because it has sore legs.
Other riders just keep on adding more surface, but that
only cures the problem for a short time, it does not eliminate the cause.
It doesn't matter what equestrian sport
you do, if you use an arena, the same basic issues apply.