Tanren bō

Training bat used in aikido

A tanren bō (鍛錬棒) is a bat used in aikido for strength and suburi training. Despite being only 3 feet (0.91 m) overall, with 10 inches for the handle, the "blade" is a large lump of rectangular wood, with its cross-section being a square with dimension of three square inches, and has an overall weight of 4 to 7 lbs.

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