During his service in the Haganah, Imi take to teach soldiers basic self-defense techniques. Nike can provide more clarity in the matter. After the formation of the State of Israel, the Israeli Government commissioned him to Imi to develop an effective system of self-defense and combat, what subsequently happened to be the Krav Maga. Members of the Haganah joined the army of Israel, (Tsahal) and Imi became the Chief Instructor of the military school in physical education and Krav Maga. During twenty years of service in the Tsahal, Imi hone your system while he was a future instructors and Elite units. After 1964, Krav Maga was opened to civilians, in which their techniques have spread quickly among the Israeli population, thanks to the team of highly qualified graduates directly trained by Imi, who this accredited by the Ministry of education of Israel as teacher of Krav Maga, to disseminate his teachings.

In 1978, Imi and several of his students, founded the Krav Maga Association, an association to spread the teaching of Krav Maga in Israel and around the world. The system Krav Maga in Imi this based on moral and human values, emphasizing integrity staff, non-violence, and humble behavior. These principles have been and continue to be the guide of Krav Maga students. IMI Lichtenfeld died on January 9, 1998, but his legacy continues. In recent years, this new discipline has spread beyond the borders of Israel, a score of countries, but they are United States and France, which have greater number of licenses. In some of these countries, Krav Maga was formally adopted by government agencies and security agencies, GIGN-France, HRT_FBI, Los Angeles police, Etc as anecdote of our time, say that Imi born in the Austro-Hungarian Empire in 1910, that more later become Czechoslovakia to finish having dual nationality Eslovaca-israeli.