This glitch shows you how to complete Marathon Pro VI and Lightweight Pro VI in a single match
Need:
Class with Marathon, Lightweight
Know how to elevator
Recommended:
Class with Commando, 1 Man Army, Tactical Insertions
How To:
Using your recommended class, elevator outside/on top of either Skidrow of Karachi
Karachi; Once on top of Karachi head towards the back lot buildings and once you've fallen under the map run towards the edge of the map to full completely under it for infinity
Skidrow; Once on top of Skidrow run towards the river at the back of the map, once you reach the river run along the sidewalk next to it heading towards to the right (facing the river). Now once you reach the end of the side walk fall underneath the map for infinity
Once falling under either map, switch classes to your Marathon/Lightweight if you haven't already, begin to sprint while falling, this will rack up massive miles and allow you to complete both marathon and lightweight pro VI in a single game.
Note:
You will only notice the challenge complete update once you've stopped sprinting so take time now and then to stop sprinting to see the challenges update
Once your under there your stuck so i would recommend carry a frag grenade on you class so once you've completed all challenges you can kill yourself and get back to game play