Practicing with shinken and sharp swords can get you killed
Going to download em if possible and share em with people who like swords, for funny jokes.
And for people with strong stomachs interested in practical applications:
When I trained for lethal force applications, one of the things I learned was that I should desire and want the enemy to be destroyed, visualize it like what you see in the video, and hunger for that result. As much as a man dying of thirst in the desert hungers for pure water. That will provide full authorization to the motor control layers invested in the spine and middle of the brain, near the brain stem. Motor control as coming from the frontal cortex or consciousness parts, actually interfere with maximum speed physical skills.