How to sprint longer in Black Ops 2

I didn’t took this information by myself I watched it in a youtube video.

If you instead of using a primary or a secondary weapon you will automatically have a combat knife, that combat knife can also earn camos but that is not the point if using the combat knife you will run almost twice the distance you can normally run and with extreme conditioning you will twice the distance you could run after, this will help you to get to objectives much quicker or get into good positioning to attack the enemy.