parkour

Parkour (pron. IPA /paʁ.'kuʁ/, often abreviated to PK) is a physical discipline of French origin in which participants attempt to pass obstacles in the fastest and most direct manner possible, using skills such as jumping and climbing, or the more specific parkour moves. The obstacles can be anything in one's environment, so parkour is often seen practiced in urban areas because of many suitable public structures that are accessible to most people, such as buildings, rails and walls.

A traceur (/tʁa.'sœʁ/) is a participant of parkour.

My younger son is into parkour. This is one of his friends, at a meet. Running straight up a wall.