Connie Britton has more in common with Jane Fonda than just starring in the same new movie.

I used to teach aerobics in New York that was what I was doing when I was pounding the pavement as an actress, Britton tells The Post. So I was very aware back in the day of Jane Fondas workout videos.

You wont see Britton or Fonda in leg warmers in their buzzy new flick, but theres plenty of bouncing around in This Is Where I Leave You, in theaters Friday. The comedic family drama, based on the best-selling book of the same name by Jonathan Tropper, features a starry cast that also includes Jason Bateman, Tina Fey and Adam Driver. When the father of the Altman clan passes, his dying wish is that the whole family come back home to sit shiva. Madness ensues as the estranged relatives grapple with skeletons in the family closet.

Britton at the CMA Awards in November.Photo: Getty Images

Britton, 47, plays the shiva-crashing older girlfriend to Drivers boy toy, the wild baby brother of the family. The Posts film editor Lou Lumenick, who saw the film when it premiered at the Toronto International Film Festival, says that despite her relatively small role, Britton manages to walk off with the movie.

Thats no surprise, really. Britton, who grew up in Virginia, has been stealing scenes in TV and film for years. Her star has been on the rise ever since she broke out as mama Tami Taylor on Friday Night Lights. Nowadays, she can be seen weekly as another mother, country superstar Rayna James on Nashville, which returns to TV for its third season Sept. 24.

But tackling this new part was something of a challenge.

When I first read the script, I had some concerns about the character, she says. It was just important for me to not feel that we were playing a caricature.

Britton with Driver and Jason Bateman in a scene from This Is Where I Leave YouPhoto: Dune Entertainment

In other words, she didnt want to play a cougar.

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