Fortalecen
Fortalecen is a form of the Spanish verb fortalecer, used as the third-person plural in the present indicative. It corresponds to "they strengthen" or, in contexts with ustedes, "you all strengthen." The verb fortalecer denotes the act of making something stronger or more resilient, whether physical, institutional, or abstract.
Fortalecer has irregularities in the first-person singular present tense, yielding fortalezco, while the other persons follow
Usage of fortalecen spans diverse domains. In health and fitness, one might say that regular training strengthens