Caidin's Guide to Mastering the Art of Self-Discipline is a comprehensive guide to developing the skills and habits necessary to achieve success in life. It provides practical advice on how to stay motivated, set goals,
From Wikipedia
Caid is a collective name used in reference to various ancient and traditional Irish mob football games. The word caid originally referred to the ball which was used. It was made out of animal skin, with a natural bladder inside.