-you harden
The word endureces is the present form of endurecer in the second person singular.
See the full endurecer conjugation


¿Solo endureces tu pecho o algo así?
Did you only work out your chest or something?
¿Endureces tu corazón y nunca sucumbirás a la tentación de la mujer, el hombre, o tu propio cuerpo?
Do you harden your heart, and never give in to temptation by woman, man, or your own body?
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