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From Pathfinder Society Scenario #6-09: The Power of Legends, which isn't enabled.

Echoes of the Swords

CALLING 1

The prowess of Swordmasters past flows through you. When you Climb, Force Open, High Jump, Long Jump, or Swim, you can spend a Mythic Point to make the check at mythic proficiency. The first time each day that you critically succeed on an Athletics check while Climbing, Forcing Open, High Jumping, Long Jumping, or Swimming, you regain a Mythic Point.

Pathfinder Society Scenario #6-09: The Power of LegendsORC