General | Combat Stamina
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Greater Ironclad Reactions (Armor Mastery, Combat)

Source Armor Master's Handbook pg. 16
You are able to quickly react to attacks.

Prerequisites: Combat Reflexes, Ironclad Reactions, base attack bonus +11 or fighter level 8th, armor trainingclass feature, proficiency with medium armor.

Benefit: You can use Ironclad Reactions more than once per round, but not more than once for each act you take that provokes an attack of opportunity. Each 5-foot step you take still counts as expending one use of an attack of opportunity.

Combat Trick (from the Combat Stamina feat)

Source Armor Master's Handbook pg. 20
You can spend 5 stamina points to use this feat without it counting against your maximum number of attacks of opportunity for that round. (See page 16.)