Marathon


 * For the Call of Duty 4: Modern Warfare challenge, see Boot Camp (challenges).

Marathon is a new perk in Call of Duty: Modern Warfare 2 that gives the user an infinite sprint duration, replacing the Extreme Conditioning perk. It is one of the first perks in Create a Class.

This perk is unlocked at the start of the game.

Pro Version
The pro version of Marathon is unlocked once a user has sprinted 26 miles across all games while it is equipped. The pro version allows you to climb ladders and vault over cover more quickly (you will take half the normal time). Aside from the obvious increase of action speed, your sprinting isn't affected by the upgrade.

Tips

 * It is useful to have this equipped with Lightweight, as completing the Perks' challenges both include sprinting for a certain distance.
 * A player using Marathon, Lightweight, and a SMG will be considerably more mobile than most other players in the game. This can obviously yield a number of advantages, especially in objective-based gametypes.
 * Marathon is very useful for covering large maps quickly. Be warned: If you use Marathon, it will take a few seconds to pull your gun up unless you are using Lightweight Pro.

Trivia
Many players will use this with a so called "Stealth Class", in which the player also uses Cold Blooded and Ninja also.
 * The way to get the Pro version is a reference to a real life marathon, where runners race a 26.2 mile course.
 * There is also a challenge in Call of Duty 4: Modern Warfare and Call of Duty: World at War called "Marathon," which is completed by sprinting the same distance of 26 miles.
 * The perk's picture and effect are very similar to the Extreme Conditioning perks in Call of Duty 4.
 * The player needs to run 104 miles with this perk to complete the VI Challenge and unlock the Marathon Pro Emblem.
 * This perk, along with Lightweight and SitRep, are considered some of the hardest to achieve the VI Challenge for.