Sai is the Ryukyu name for a traditional Okinawan weapon.

The basic form of the weapon is that of a pointed, rod-shaped baton, with two long, unsharpened projections (called yoku) attached to the handle. The very end of the handle is called the knuckle. Contrary to popular belief, the shaft of a traditional sai is not a blade.

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Miyamoto Musashi (宮本 武蔵?, c. 1584 – June 13, 1645), also known as Shinmen Takezō, Miyamoto Bennosuke or, by his Buddhist name, Niten Dōraku,[1] was a Japanese swordsman and rōnin. Musashi, as he was often simply known, became renowned through stories of his excellent swordsmanship in numerous duels, even from a very young age. He was the founder of the Hyōhō Niten Ichi-ryū or Niten-ryū style of swordsmanship and the author of The Book of Five Rings (五輪の書 Go Rin No Sho?), a book on strategy, tactics, and philosophy that is still studied today.

The location of knee pain can help identify the problem. Pain on the front of the knee can be due to bursitis, arthritis, or softening of the patella cartilage as in chondromalacia patella.

Pain on the sides of the knee is commonly related to injuries to the collateral ligaments, arthritis, or tears to the meniscuses. Pain in the back of the knee can be caused by arthritis or cysts, known as Baker’s cysts. Baker’s cysts are an accumulation of joint fluid (synovial fluid) that forms behind the knee. Overall knee pain can be due to bursitis, arthritis, tears in the ligaments, osteoarthritis of the joint, or infection.

Soldiers are as strong as the general who leads them, and, in a like manner, students can only excel under an excellent instructor. We cannot expect a bamboo to grow in a field of reeds, nor can we expect to find an outstanding pupil under an unqualified teacher.

It is of particular importance that the two aspects of TaeKwon-Do, the spirit and the technique, must be taught together. Therefore, a qualified instructor must combine the qualities of a scholar and a soldier if he is to produce pupils of noble character and outstanding skills.