[Answer] What extreme sport originated with a pre-WWI French lieutenant?

Step 1 : Introduction to the question "What extreme sport originated with a pre-WWI French lieutenant?"

...In the years leading up to World War I, French officer Georges Hébert came up with “la méthode naturelle.” This intense physical training regiment had soldiers running, jumping, and balancing their way through an obstacle course known in France as “parcours du combattant.” One soldier, Raymond Belle, applied these skills in his career as a firefighter, scaling up buildings barehanded and jumping between rooftops. His son David is credited with turning those athletic skills into the extreme sport known as parkour.

Step 2 : Answer to the question "What extreme sport originated with a pre-WWI French lieutenant?"

Parkour:

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