Marathon


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

Marathon is a tier 1 perk in Call of Duty: Modern Warfare 2 and a tier three perk Call of Duty: Black Ops

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

Pro Version
The pro version of Marathon is unlocked after the player has sprinted 26 miles while it is equipped. The Pro version allows the user to climb up ladders and over cover twice as fast, allowing for quick battlefield maneuvers. It should be noted that while players vault objects faster, their sprint speed on level ground is still the same.

Call of Duty: Black Ops
Marathon will return in Black Ops as a tier 3 perk.

Tips

 * It is efficient to have this Perk in conjunction with Lightweight, as both Pro challenges involve sprinting for a certain distance.
 * A player using Marathon, Lightweight, and a light weapon will be considerably more mobile than most other players. This can obviously yield a number of advantages, especially in objective-based gametypes.
 * Marathon is very useful for covering large maps very quickly, and makes access to strategic points easier at the beginning of matches.
 * Marathon is a good perk to use with a Riot Shield or LMG because of their low mobility.
 * Marathon is usually used in objective based games (Domination, Sabotage, etc.) because it allows a player to reach objectives faster than others, giving their team an advantage from the start.
 * If the player uses this perk in conjunction with a Pistol with a Tactical Knife, it can significantly increase their reaction times.

Trivia

 * 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 a real Marathon, 26 miles.
 * The perk's picture and effect are very similar to the Extreme Conditioning perk from both Call of Duty 4 and Call of Duty: World at War.
 * 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.
 * There is a rumor that you can run out of Sprint while using the Marathon perk. This is not the case. Game files show that unlimited amounts can be used.