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Modal auxiliary verbs are a special type of auxiliary verb, used mainly to express ability, likelihood, permission, and obligation. These include 'will', 'would', 'can', 'could', 'shall', 'should', 'may', 'might', 'must', 'ought', 'need', and 'dare'. Please do not use this tag for the non-modal auxiliaries 'be', 'have', or 'do'.
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Modality with Could
"The reason you couldn’t sprint a marathon, he says, is that your body can’t supply energy rapidly enough using the aerobic system."
Extracted from a BBC article.
I can't understand the use of could …