Possible Clues:

• Sport that involves navigating an urban environment
• Sport that turns everyday objects into an obstacle course
• Sport that might drive you up the wall?
• Urban obstacle course activity
• Efficient movements
• Sport featuring improvisational movement through an obstacle course
• Subject of a lot of lame YouTube videos of people trying to jump off walls, over fences, etc
• Sport involving the actions that begin 17-, 23-, 46-, and 57-Across
• Free-runners' sport