Yes, they can be accepted as checked baggage. You should check with the specific airline for their requirements.
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If it is a weapon, it can be found in the martial arts. The skills and mental attitude related to the use of any weapon is a martial art.
Kabudo is the martial art that teaches the use of traditional martial arts weapons including the sai. Some karate schools include kabudo in their standard curriculum.
It depends on the specific martial art. Most of the arts will teach something along the lines of defense against weapons.
I believe you're thinking of Jet Li.
Martial arts weapons most likely started off as hunting implements during the earliest days of man thousands of centuries ago. Then, as different groups began to fight over territory or access to food, they started using their bows and arrows and spears on each other. This led to the implements being used as military weapons (martial arts are a natural outpouring of war). People later came to look upon weapons training as a form of discipline. This led to the continued practice of weapons even during times of peace. This is why students of Chinese martial arts, for example, are required to practiced swords, spears, and staves even though they have no real use for them in the modern world.