The terminology Gi stand for training in the Kimono/gi. To train in a gi or nogi is always a controversial topic that get debated in grappling forums in the internet. To understand its relevance and impact, one needs to look at the origin of Brazilian Jiu Jitsu. To start with. we will never know what exactly what was taught by Maeda to Carlos Gracie back in 1914! All we know is that Carlos only trained 3 years under Maeda and went on to open his Gracie Jiu Jitsu Academy in Rio later on. So to start with, you have the Gracie Jiu Jitsu as the main lineage from Maeda as the most famous and successful school in Brazil. Maeda also taught others Brazilians as well. In fact, you have the lineage of Fadda which is Jiu Jitsu as well. Unsurprisingly, the Judo Federation of Brasil also claim Maeda as their pioneer. The reason is simple: Jiu Jitsu and Judo was the same thing back then. In Brazil, they love training in Gi. I don't think you will find an academy t...