His left knee is extended, but his right knee is flexed.
Flex is a slang term that means "to flaunt," whether it's your physique, your possessions, or something else you think is superior to those of others. Flexing is frequently criticized as a power move that is arrogant and insincere.
Muscle flexing is more accurately known as muscle contraction because when you flex your muscles, you create tension that causes the muscle fibers to shrink or contract temporarily.
To flex is to bend or tense a muscle or body part, or to demonstrate the strength of something. Bending the knee is an example of flex. Flex can be demonstrated by demonstrating your memory skills.
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