The 3 pole challenge is designed to improve balance, suppleness, proprioception, strength and the relationship between you and your horse. The exercises can be done form the ground or ridden and will help enormously to improve your horses body in many ways. Various problems can occur from blocks in the horses body caused through tension, restriction in coordination and lack of balance. All these issues can be linked to behaviour and physical/mental issues with in the horse this includes difficult to handle/lead, spooky, tense/difficult to ride, tricky to load the list is endless. Helping the horse to unblock the body and mind and to build the relationship between horse and human goes long way to improve these issues.
All you need is 3 poles and these videos will explain the rest.