Krav Maga sounds like it could be really fun and interesting
It is a military self defense fighting system developed by the Israel Defense Forces
Wow, intense.  Do many people practice Krav Maga?
It focuses on real world situations and is extreme, so it can be hard for some people to handle it
Did one person in particular come up with the idea for Krav Maga?  Or was it more of a group effort?
use of his training as a boxer and wrestler while defending the Jewish quarter against fascist groups in Bratislava, Czechoslovakia, during the mid-to-late 1930s. In the late 1940s, following his migration to Israel, he began to provide lessons on combat training to what was to become the IDF.
From the outset, the original concept of Krav Maga was to take the most simple and practical techniques of other fighting styles (originally European boxing, wrestling, and street fighting) and to make them rapidly teachable to
Krav Maga
Krav Maga (; , "lit." "contact combat") is a military self-defence and fighting system developed for the Israel Defense Forces (IDF) and Israeli security forces derived from a combination of techniques sourced from boxing, wrestling, aikido, judo and karate, along with realistic fight training. 
Krav Maga is known for its focus on real-world situations and its extreme efficiency. It was derived from the street-fighting experience of Hungarian-Israeli martial artist Imi Lichtenfeld, who made