Regarding the care and feeding of your wooden martial arts training weapons.
Before each training session one should examine any wooden training weapons for splinters, cracks, or breaks. When in doubt but the training tool aside and borrow or use another one.
Same with after each training session- check for any splinters or cracks and assess or repair them for the next class.
Every few months or as needed consider lightly sanding the wooden training weapon followed by applying lemon oil or some other wood oil to prevent the wood from drying out and warping.
And of course, naturally one should never practice with real training weapons- no shinken training tools.