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There is a Legacy version here.

PFS StandardAwesome Blow Feat 14

Barbarian Concentrate Rage 
Source Player Core 2 pg. 83
Prerequisites Knockback

Your attacks are so powerful, they can flatten your opponents. When you use Knockback, you can attempt an Athletics check against your target's Fortitude DC.

Critical Success You gain the critical success effect of a Shove, then the critical success effect of a Trip against the target.
Success You gain the success effect of a Shove, then the success effect of a Trip against the target.
Failure You gain the normal effect of Knockback.

Traits

Concentrate:

An action with this trait requires a degree of mental concentration and discipline.

Rage:

You must be raging to use abilities with the rage trait, and they end automatically when you stop raging.