premise: One form of ground fighting is Brazilian jiu-jitsu.
hypothesis: Brazilian Jiu-Jitsu ( [ dʒuːˈdʒɪtsuː ] [ ˈʒiw ˈʒitsu ] , [ ˈʒu ˈʒitsu ] , [ dʒiˈu dʒiˈtsu ] ) ( BJJ ; jiu-jitsu brasileiro ) is a martial art , combat sport system that focuses on grappling and especially ground fighting . Brazilian Jiu-Jitsu was formed from Kodokan judo ground fighting ( newaza ) fundamentals that were taught by a number of individuals including Takeo Yano , Mitsuyo Maeda and Soshihiro Satake .