Hojo undo or supplementary training is important for developing speed, power and technique in your self-defense. Taika Seiyu Oyata demonstrating hojo undo with heavy tanbo in Moorhead, MN in April of 2005 at the Shinkenkan Ryute dojo.
For bo, just find a length of iron or steel at a hardware or auto supply. Tanbo hojo undo can also be performed with a good heavy pair of sai or youth baseball bats.
