How do i powerup my number under my health?

I just want to know what buttons to press to powerup the number under my health.

Submitted Answers

From XTApocalypse on Feb 22, 2011 9:53 am GMT

Hold X and quickly tap backwards twice, holding it the second time.
From broken_destiny on Nov 20, 2011 11:18 am GMT

Yes, hold guard (x) and double tap backwards. The number is you'r ki

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