Horse Agility Challenge uk promotes only horse/handler lead line partnerships.
For competition and judging purposes it is your ability to work together as a partnership that is being tested.
Our definition of 'partnership' is a relationship where both parties can play an equal part.
It is, for this reason, we do not support 'ridden' or 'at liberty' agility. Both these require a different relationship dynamic, one that we do not consider as part of our values of horse/handler equality.
When we ask a horse to join us in our world, it cannot in reality be an equal relationship, but we can at least in our actions, thoughts and perceptions try to believe it to be so !