The old masters considered the horse’s natural crookedness to be a major obstacle in developing balance, suppleness, collection, impulsion, and “obedience” (i.e. positive responsiveness to the aids). Put positively, functional straightness is the foundation of balance, suppleness, collection, impulsion, and “obedience”. Without straightness, the horse won’t get very far in his training. Unfortunately, overcoming crookedness is not a trivial matter. It requires constant attention, and if the rider doesn’t work on straightening her horse every day, his innate crookedness will gradually increase again.