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 3 perk in 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 go over cover faster, 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 returns in Black Ops as a tier 3 perk. It doubles the player's sprint duration. Its Pro version gives the player unlimited sprint duration.

Challenges

 * 26 Miles: Sprint 26 Miles using Marathon.
 * First Blood: Get the First Blood Medal 10 times.
 * Captures: In Capture the Flag, get the Flag Capture medal 15 times while using Marathon.

After completing the challenges, the Pro perk can be bought with 3000 CoD Points.

Tips
Using Lightweight in conjunction with Marathon can help with the First Blood and Captures aspects of attaining Marathon Pro.

Call of Duty: Modern Warfare 2

 * 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 perks to achieve the VI Challenge for.
 * The perk name Marathon was based off of the challenge from Call of Duty 4: Modern Warfare "Marathon", because the challenge was finished by sprinting 26 miles, being adopted as one of the steps required to unlock Marathon Pro.
 * Sprinting 26 miles is necessary for completing the pro challenge because a marathon race is approximately 26.2 miles.

Miscellaneous

 * 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.