Because the body’s fight-or-flight system turns on like a stopwatch in the front line, adrenaline floods the bloodstream, boosting heart rate and blood pressure. That surge makes muscles ready to react in milliseconds, increases alertness, and temporarily suppresses pain—essential for rapid decision‑making and sustained effort. In tactical terms, the faster heart keeps the nervous system in high gear, so a warrior can shift weight, aim, and move before the enemy even notices. The trade‑off is that the system burns fuel fast, so stamina management becomes critical once the adrenaline starts to wane.

Absolutely, maintaining a steady supply of glycogen and ensuring efficient oxygen delivery is key once the adrenaline tide recedes; without that, even the sharpest mind will slow down before the next engagement.