Needs review
Source: Player's Handbook II

Description: When you maintain your combat focus, your clarity of purpose and relentless drive allow you to overcome your body's frailties.

Prerequisites: WIS 13, Base Attack Bonus +9, Combat Focus

While you maintain your combat focus, you gain fast healing 2. You lose this benefit when your combat focus ends. If you have three or more combat form feats (Combat Defense, Combat Focus, Combat Stability, Combat Awareness), the benefit of this feat improves to fast healing 4.

Special

A fighter can select Combat Vigor as one of his fighter bonus feats.