Why do you get second wind during running?
Show answer & explanation
Answer: Body switches fuel sources
Muscles become numb — Wrong. Muscles don't go numb—you actually feel better! Second wind occurs when your cardiorespiratory system catches up to demand.
Body switches fuel sources ✓ — Correct! Initially, muscles burn stored ATP and glycogen anaerobically, creating fatigue. After 10-15 minutes, your body adjusts: breathing syncs with demand, blood flow optimizes, and fat burning increases. You feel suddenly energized!
Temperature drops naturally — Wrong. Body temperature actually rises during extended running. Second wind is about metabolic adjustment, not temperature changes.