00:00What would happen if you just kept running and never stopped?
00:04First minutes, your body feels strong.
00:07Your heart pumps faster, sending oxygen to your muscles.
00:1110 to 30 minutes, your breathing speeds up.
00:14Your body starts burning stored sugar for energy.
00:18After an hour, your body switches to fat for fuel,
00:21but you're already losing water fast.
00:24In three hours, your muscles begin to break down.
00:27Tiny tears form as your body struggles to keep up.
00:326 to 7 hours, your brain gets tired too.
00:36You feel dizzy, confused, maybe even hallucinate.
00:4010 hours, if you keep going, your body overheats.
00:45Without rest, it can lead to collapse.
00:48Running is powerful, but even your body has limits.
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