Michelle Miller reports for CBS that more than 3,500 senior citizens are studying cane fu. In cane fu seniors learn how to use canes as weapons for self-defense. Michelle Miller comments. Mark Shuey, a tae kwon do and hapkido expert, came up with the cane fu idea. He is also the founder of Cane Masters, a company that manufactures custom canes. You can read more about cane fu here, Here and here.