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LiveScience
LiveScience
Emily Cooke

What happens when you 'hit the wall'?

Live Science Laura Richardson
Top-half of a female runner shown with her hands on her face against a blurred background. She looks completely exhausted. She is wearing a black vest, red watch and white baseball cap, as well as blue nail varnish. .

You've reached mile 20 (kilometer 32) of your marathon and suddenly a wave of exhaustion crashes over you, making you feel dizzy and causing your legs to feel like lead. One more step seems impossible.

You've likely "hit the wall" — but what does this mean?

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