Brazilian Jiu-Jitsu or BJJ is a martial art based on grappling and ground fighting, focusing on the skill of controlling one's opponent through techniques that force him or her to submit. Brazilian jiu-jitsu focuses on getting an opponent to the ground in order to neutralize possible strength or size advantages through ground fighting techniques and submission holds involving joint-locks and chokeholds. On the ground, physical strength can be offset or enhanced through proper grappling techniques.