Your answer is simply the sympathetic nervous system
Definition-The sympathetic nervous system (SNS) is part of the autonomic nervous system (ANS), which also includes the parasympathetic nervous system (PNS). The sympathetic nervous system activates what is often termed the fight or flight response.
There are 1000 meters in 1 kilometer, and so you cover 10,000 meters in a 10k race
hope this helps
