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There is a Legacy version here.

PFS StandardKnockback Strike [two-actions] Feat 10

Concentrate Monk 
Source Player Core 2 pg. 124

You focus your strength into a blow powerful enough to push an enemy away from you. Make an unarmed Strike. If you hit, attempt an Athletics check to Shove the target. This attack uses the same multiple attack penalty as your Strike, and doesn't count toward your multiple attack penalty.

Knockback Strike Leads To...

Improved Knockback

Traits

Concentrate:

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