The undisputed king of ground fighting styles, BJJ is a staple for any well rounded martial artist.  Known as the "gentle art", jiu-jitsu is unique among fighting systems because it's relatively gentle to train but also devastatingly effecting in both the octagon and in self defense scenarios.  Both gi and no-gi styles taught.

"Peace, love, and martial arts."

Brazilian Jiu-Jitsu

BJJ