The endocrine stress response increases cardiovascular tone, heart rate, breathing rate, blood pressure, and shunts blood to exercising muscles.

“were three you were running for your life or run for a meal which is they increase cardiovascular tone in epinephrine is doing the first five seconds of it by 30 seconds and glucocorticoids you're bolstering it as well and it's that same logic you're running like crazy you want to deliver that glucose to your thigh muscles as quickly as possible you increase your heart rate you increase your breathing rate your blood pressure you alter your vasculature so you're preferentially shunting to the exercising muscle so that makes perfect sense”