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Flexed We use chest muscles all the time without realizing it, but it’s during big movements—such as pushing, squeezing, and pulling—that they really stand out. When flexed, chest muscles can bunch and show striations like any other muscle; but they must have sufficient size to do so; therefore, only athletic or muscular characters’ chests reveal a muscular flex like the one seen here. Note also how the collarbones crunch into a V shape when the chest flexes.