Brazilian Jiu-Jitsu (BJJ) is a martial art based on grappling and ground fighting techniques. The aim of Brazilian Jiu-Jitsu is to control and subdue a larger and stronger opponent through the use of superior techniques, leverage, and body mechanics. With an emphasis on grappling rather than striking, students are able to practice with varying levels of intensity, without the threat of serious injuries which can occur more often in martial arts focused on punching and kicking. Traditionally, the Brazilian Jiu-Jitsu student practices in a gi or kimono, a martial arts uniform similar to a judo outfit. In recent years, many schools and academies have incorporated no-gi BJJ, commonly referred to as submission wrestling, to their teaching curriculum. In no-gi BJJ, students typically wear t-shirts and shorts, instead of the typical gi. Brazilian Jiu-Jitsu classes will often incorporate takedown training, utilizing Judo throws (tachi-waza) and wrestling techniques, as well as proper break-fall techniques (ukemi).