Retsev literally means "continuous attack". In proper Krav Maga, retsev is the basis for everything we do. If you watch David Kahn's youtube video (
) @ about 28 seconds in, when he moves you'll see that Dave throws his punches and kicks on the half-beat. In otherwords, he'll start to punch as soon as his kick has made impact, not after it touches the ground, and he'll start to kick as soon as his hand/fist touches, not waiting for his arm to fully come back. IKMF (in the U.S.A., at least) and KMAA (World-Wide) do
not teach this. I truely do not understand how they can even call what they do "Krav Maga" without teaching retsev the way Imi created it. It's unfortunate that most Krav Maga schools are just cheap imitations of what Krav Maga truely is...