Kenkyu is a style of combat that focuses on manipulating the earth. Nasir tenses and compresses his muscles as much as he can with the use of Tekkai, he then uses Haki for good measure, and then contacts that limb with the ground in order to flick the limb to release an internal shockwave into the ground as a seismic wave. If the shiver is inputted with skill, the seismic wave will move the earth as the practitioner desires.