Etymology
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flex (v.)

1520s, "to bend," usually of muscles, probably a back-formation from flexible. Related: Flexed; flexing.

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Definitions of flex
1
flex (v.)
contract;
flex a muscle
flex (v.)
exhibit the strength of;
flex (v.)
form a curve;
Synonyms: bend
flex (v.)
bend a joint;
flex your wrists
Synonyms: bend
flex (v.)
cause (a plastic object) to assume a crooked or angular form;
Synonyms: bend / deform / twist / turn
2
flex (n.)
the act of flexing;
he gave his biceps a flex to impress the ladies
From wordnet.princeton.edu