Can kenjutsu improve your memory?

Can. It keeps the brain active. The brain is like a muscle, and regular exercise promotes brain development. Learning a new language, a musical instrument, or playing mind games are all good ways to keep your brain active, so playing kendama can improve your memory. Kendama originated in the 11th century as a traditional Japanese folk game, and itself came from a French game called "Bilbokai" at the time.