A lot of riding problems are the consequence of natural crookedness. Luckily this can be solved or prevented by doing Gymnastic Groundwork, the third element of Horsefulness Training. Gymnastic Groundwork consists of work in hand and lunging.
Lunging is a wonderful way to gymnasticise your horse, meaning that you supple, strengthen and straighten the horse. But be careful: lunging can only be healthy for a horse if it happens in a responsible and correct..