están flexionando
-they/you are flexing
Present progressiveellos/ellas/ustedesconjugation offlexionar.

flexionar

O mejore dicho, ya los organizadores existentes y los luchadores de los 31 estados mexicanos y su distrito federal están flexionando los músculos y expresando su voluntad, su necesidad, de juntarse en tal ejército.
Or, better said, already existing organizers and fighters from throughout Mexico's 31 states and its federal district are flexing their muscles and expressing their will, their necessity, to join together into such an army.
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celery