MW3 Glitch - Extreme Conditioning Pro Parkour Challenge with Ballistic Vests (Easy Fast XP)

Just a little glitch I came across. This video will show you how to perform a glitch on Call of Duty: Modern Warfare 3 (COD: MW3) that allows you to earn the Extreme Conditioning Pro Parkour challenge quickly using Ballistic Vests. This allows you to earn XP quickly, giving you levels quickly. Every Ballistic Vest stall counts as a mantle towards the Extreme Conditioning Pro 'Parkour' challenge, which can help a lot towards this challenge, and a decent amount of XP. This would probably also work with Care Packages, but they are very unsubtle.