A disciplined person is a person who knows what to do and then does it.
Someone without self-discipline knows what they should do, but just doesn’t get around to doing it.
Discipline, like a muscle, is developed with use.
By training in the Martial Arts, you are encouraged to work through difficult movements. As you progress up the belt ranks, you develop the ability to push yourself, while maintaining your focus and concentration, knowing that this is what it takes to become proficient.