Ahh thank u! although I tried sprint and crouching alternally (shift and after E to crouch) but Leon is slow when I do it and I can't get do it as other players, they are very fast doing this technique

Hello! I have seen a lot of people using a weird techique which is called "crouch dash" as I saw. Someone can help me please? I really want to learn to do it :D it's very fast to run!