Quand on n'a pas bonne tête, il faut avoir bonnes jambes. 
Related proverbs
Similar proverbs in another language
Latin
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Pedibus compensanda memoria est.
Remember to compensate for the feet.
German
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Was man nicht im Kopfe hat, muß man in den Beinen haben.
What you don't have in your head, you have to have in your legs.
Czech
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Co není v hlavě, musí být v nohou.
What is not in the head must be in the feet.