The Jutsu Jutsu no Mi is a little strange even among the Paramecia Devil Fruits. When one eat's it their body will go into a hyper insensitive mode for several weeks and render them helpness. During that time frame every technical motion the user has seen performed before their eyes that does not rely on elemental ability will be replayed within the brain and slowly encoded into the muscles along the entire form. When it finishes up a terrible ache is left behind as though the user had overstrained every muscle in their body-- a result of muscle memory trying to physically re-enact every one of the techniques demonstrated before it as they were learned.