Counter-Strike: Source/Strategies

All players run to move by default in Counter-Strike: Source, and if you're quiet, you can hear their footsteps. This can help pinpoint where people are if they're close to you, or when to shoot if you feel somebody's about to pop out from around a corner. Players who walk instead of running (by holding down Shift by default) make an almost inaudible amount of noise, and so this tactic doesn't work. Crouching will also soften the noise you make.