Since this could refer to a few different things (a character concept, a fitness/yoga routine, a piece of creative writing, or a slang description), I will provide a of a character called "Flexy Teen" in the style of a vignette.
Her body was a question mark that always found the answer. At sixteen, she understood a secret that most adults forget: rigidity breaks, but flexibility survives. flexy teen
She wasn't just bendy. She was unshakable. The flex was in her spine, yes—but really, it was in her spirit. She could twist out of any argument, stretch herself thin for her friends, and still snap back to center before the final bell rang. Since this could refer to a few different
When her mom yelled about the electricity bill, Maya bent backward—literally—into a bridge, looking at the ceiling fan upside down. “The world looks nicer from down here,” she said. Her mom stopped yelling and laughed. She wasn't just bendy
Here is the piece: The Unbreakable Girl
She doesn’t walk through the world; she flows around it.