"Sin City: A Dame to Kill For" cast Jessica Alba's fitness regimen revealed as dance exercises allows her to show her sexy side to play a deadly stripper once again.

Jessica Alba will reprise her role as Nancy Callahan, nine years following the original "Sin City" was released. Although there's a lot of mileage on her years along with two kids, she's still as sexy as ever.

The "Machete" actress worked with Jennifer "JJ Dancer" Johnson to develop her routines and give her that dancer's body, People reported.

In explaining their routine, Johnson said: "We just started to move to the music, and we were getting her used to the sensuality and moving around in heels in the beginning. Then we started choreographing routines on her body."

"Sin City: A Dame to Kill For" cast Jessica Alba will suffer through two to five hours of sessions with Jennifer. They oftentimes bring their favorite sexy songs to help get her into the mood.

The choreographer also told the 33-year-old actress to dress in a way that will make her confident of her sexiness.

"She would just follow my body. I'd have her winding, grinding and moving. We would grab the wall, I'd have her crawling, arching, humping. It got real up in there!' Jennifer told People. "She just got the heels - she would wear clothes that showed her body and made her feel sexy."

All that winding and grinding should make "Sin City: A Dame to Kill For" cast Jessica Alba blush considering that she's a bit of a "prude."

"'I don't know. I grew up Catholic. In my head I'm always thinking, 'Oh God, can my grandma see this?'" she told Entertainment Weekly.

Directed by Robert Rodriguez, "Sin City: A Dame to Kill For" tells the story of Dwight (Josh Brolin) who is being tracked down by Ava Lord (Eva Green), the woman he ever loved.