Ready Up is a perk featured in Call of Duty: Ghosts. It is the first perk unlocked and available as soon as the player purchases a Soldier (though it is not selected within the set of Perks the 5 basic loadouts come with at first; players must deselect 1 point from their loadout before adding it in their loadout). It allows the player's weapon to be ready faster after sprinting.
Ready Up forms the core of any aggressive rushing class. It allows the player to win more close quarters gunfights, helping on getting the first shot on target. It is most useful on Submachine guns and Shotguns, as they are naturally close-quarter weapons, while being very beneficial on Assault rifles and Light machine guns. The perk is less useful on Marksman rifles and Sniper rifles, as they tend to require a more stationary playing style to be effective, but using it with these weapons is not a hindrance by any means.