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. It is similar to the Extreme Conditioning perk from Call of Duty 4: Modern Warfare and Call of Duty: World at War

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 allows players to quickly climbs ladders, making it useful if players are constanly being ambushed while climbing them.

Call of Duty: Black Ops
Marathon returns as a Tier 3 perk in Black Ops.

Overview
Marathon doubles the player's sprint duration. Its Pro version gives the player unlimited sprint duration.

Pro 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.

Tips

 * Using Lightweight in conjunction with Marathon can help with the First Blood and Captures aspects of attaining Marathon Pro.
 * One of the easier ways to attain the First Blood challenges is to play Search and Destroy, as there are multiple rounds in which to gain the award.
 * Capture The Flag is an alternative to Search and Destroy, as it couples all 3 of the requirements.

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 on 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.

Call of Duty: Black Ops

 * In Combat Training, the player does not need to complete the challenge "Captures" to achieve Marathon Pro since one cannot play objective based gametypes in Combat Training.
 * Even though a player can't climb fast like in earlier versions, one can still move through windows by jumping and then crouching; this will cause their character to lift up their legs.

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.