From Pathfinder Beginner Box: Secrets of the Unlit Star, which isn't enabled.

Battle-Trained Human (BB)

HERITAGE

Ancestry Human

Your family has trained for battle for generations, granting you advantages against your enemies. You gain a +1 bonus to initiative rolls. In addition, you gain the Diehard feat.

Note: This heritage is from the Beginner Box and features non-standard heritage features

Pathfinder Beginner Box: Secrets of the Unlit StarORC