endurecí
-I hardened
The word endurecí is the preterite form of endurecer in the first person singular.
See the full endurecer conjugation

endurecer

Supongo que me endurecí.
I suppose I hardened some... to cope.
Saben, salimos y, saben, después de mucho tiempo, salí y me arriesgué, y hasta endurecí mis muslos.
You know, we went out and, you know, for the first time in ages, I put myself out there, and I took a chance, and I even got stronger thighs.
Se resistía, así que endurecí mi entrada.
He was resisting, so I went in hard.
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