The "Nine Yang Manual" is a fictional martial arts text from the popular Chinese novel series, The Legend of the Condor Heroes, written by Jin Yong. It is known for its advanced techniques and powerful internal energy cultivation methods, which are said to enhance a practitioner's martial arts abilities significantly. In the story, the manual is associated with the character Yang Guo, who learns its secrets to become a formidable fighter. The techniques outlined in the manual emphasize the importance of balance, strength, and mental focus, making it a coveted treasure among martial artists in the series.