Dancing in pitch black "sounds slightly weird" but it's set to become a weekly routine for some.
"The movement has caught on and people really love it," said No Lights, No Lycra's west Auckland ambassador Claire Smith.
The idea that began in Melbourne in 2009 has now found its way to the north-west.
No Lights, No Lycra is set to feature every week from April 4 in Waimauku.
"You're not having to go out clubbing, or getting drunk, but going out to have a boogie," the 41-year-old said.
After going through "post-baby blues" a few years ago, Smith said it helped her get out of it.
"I quite liked having a dance before kids came along."
The Muriwai resident started going to central Auckland classes run by Jamie Newman and was hooked.
Smith has met others whom have said it helped to deal with depression or mental illness.
"People find it really good for their mental well-being."
The mother-of-two said it's just like being in a club, or going out dancing – but there's no alcohol and it's cheaper.
"It's really fun for those who enjoy going out and having a dance, but may be self-conscious about how they dance."
It's great for people who don't like being in a public setting, or don't like having people come up to them trying to dance with them, Smith said.
"Its also a nice, fun way to sweat a bit and burn a few calories too."
The self-employed running coach hasn't organised a No Lights, No Lycra event before, but is hoping it "grows organically" through interest on social media and word of mouth.
"You could have five or 30 in there and it won't make much difference once the lights are out."
Smith said she has a playlist of "really good" dance tunes.
"Once people turn up, we turn off the lights and the music goes on."
But there's enough light so people don't bang into each other, she said.
"It's akin to going to a gym class - except nobody is leading it."
No Lights, No Lycra will run every Tuesday from April 4. The lights go off and music goes on at 7.30pm at Waimauku Memorial Hall, Waimauku.
$8 cash entry – door sales only.