The greatest gymnast Mary Lou Retton has ever seen is a wonder.

She has the power to get such height on the vault it seems as if she’s bungee jumping from the roof.

She has the energy to make the final tumbling pass of her boundary-pushing floor exercise — when most of her peers are breathless and counting the seconds until the music stops — as fresh as her first.

She has the poise to flip and swoop and turn on a 4-inch wide slab of wood 4-feet off the ground so fluidly it’s like an X Games version of ballet.

“The god-gifted ability of explosiveness and just her athleticism, you can’t teach that,” said Retton, the 1984 Olympic champion. “You cannot teach that. You can teach somebody to be a little bit more graceful. You can teach someone more skills, but you can’t teach that special unique quality that Simone has.”

Get ready to know Simone Biles. In her sport, the live-wire 19-year-old from Spring, Texas, enjoys first-name only status, the byproduct of a three-year run of dominance that includes 14 world championship medals with a record 10 golds and three all-around titles.

“We’re joking she should have to compete with the guys,” Retton said. “She’s so good. She pushes it. She’s just special.”

If still somewhat anonymous outside of the buzzing fans who inhabit the social-media driven gymternet. For all of the awe Biles inspires, the one thing — really the only thing — Biles lacks is that Olympic moment of triumph with the world — the whole world, not just part of it — watching.