Mixing strength and agility with a well-executed strategy, Jessie Graff impressed the world this week as she completed Stage 1 of the national finals of NBC’s “American Ninja Warrior.”

The “Supergirl” stuntwoman made history by becoming the first woman to complete the specific course on Monday night in Las Vegas.

Having “very little body fat” helps, too.

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Last year, Isaac Caldiero became the first person to ever win the show — and the $1 million prize — by completing the course in the best time. Graff, 32, is leaping into the “Ninja” footsteps of Kacy Catanzaro, who became the first woman to complete a city finals course two years ago.

It’s all a little confusing. The bottom line? These people are all in amazing shape and can kick your you-know-what.

Only eight of 45 competitors completed this new Stage 1 course on Monday.  Graff, the only woman to make it through, actually made it look easy, hitting the buzzer with 12 seconds left on the clock — putting her in fourth place for the night. She had 2:20 to complete eight obstacles — named things like Log Grip, Propeller Bar, Jumping Spider, and Warped Wall.

(They’re not unlike that wacky ABC show, “Wipeout” — but this is way more serious.)

Next week is the second episode of the Las Vegas finals, featuring the other half of the Stage 1 runs. Expect to see favorites such as Catanzaro and Meagan Martin hit the course to challenge Graff, who returns Sept. 12 to compete in Stage 2.

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Here are some key things to keep in mind about how to make it through the course:

Having circus experience helps.
Graff took circus classes at age six, then competitive gymnastics for six years. She pole-vaulted through high school and college. She has earned black belts in Taekwondo and Kung Fu.

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Her day job keeps her in shape.
Graff isn’t sitting at a desk all day like most of us. She’s tumbling, trampolining, jumping on rooftops, bridges, and buildings and often has to do “dramatic wipeouts” in her stunt job, she told USA Today.

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Just because you’re injured doesn’t mean you’re done.
Graff tore her ACL, TCL, and meniscus in a 2014 injury. To recover she needed “a goal,” she said. She set her sights on “Ninja Warrior,” spending eight months doing pull-ups as she recovered. The change in focus gave her added strength — which came in handy for Monday night’s Flying Squirrel obstacle, in which she had to hang and swing between trapezes and finally onto a rope ladder.

Arm strength is crucial.
“It’s a combination of skills — upper-body strength, rock climbing, and grip strength is key,”ANW executive producer Kent Weed told The Hollywood Reporter as to what’s needed to do well on the show. Having “very little body fat” helps, too.

Strong can be feminine.
Graff, who ran the course in a green skirt outfit she called her “Green Lantern” look, is already an inspiration to many for her accomplishments so far. “I hope it will show women that feminine is strong, that we can frequently do more than people think we can — sometimes even more than we believe ourselves — if we’re willing to work for it.”