How do you crabwalk in gears of war

i don't think it is possible in single player and i am at work so i can't access youtube but if you search on youtube for "how to crab walk gears" without quote marks, you should get 500 videos or so on how to just that, then just take your pick and enjoy cheating.

P.S. polite gaming community tolerates crab walking on non-ranked matches, but they don't like it on ranked, that's an easy way to get banned.

:)