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Basicly, i was playing domination, when i had my sentry gun out.
I was trying to jump onto a box, with the sentry gun.
After a while, extreme conditioning : parkour challenge was completed.

So, how to do it.

1. Achive a sentry gun killstreak
2. -> on the controller to bring the sentry out, but do not place of floor.
3. Jump up and down WITH Extreme Conditioning. (XXXXXXXXXXXXXXXXXX)

Please refer to your challenges before starting, so you know maybe how long it will take. Its not magic.

I will try post proof later on as its late right now.

(c) Superahm13 PSN

your taking credit for someone elses glitch man someone just posted this about trophy system it does the same thing

Didn't work over here.. And I jumped a lot of times..