When fitness junkie Jennie Monness was trying to get pregnant back in 2016, the now-35-year-old was told that her six-day-a-week high-intensity workout routine might be hampering her efforts.

An acupuncturist attributed her irregular cycle to excessive exercise, while a medical doctor told her that she needed more fat on her body and advised her to “go eat an avocado.”

And so, after about a year of trying to conceive naturally and a round of IVF, Monness, who works in early-childhood development and lives in the Flatiron District, switched up her workout game.

In January of 2017, she ditched her high-intensity bootcamp-style dance cardio and heated mat workouts at a studio where “the vibe was so intense that you didn’t want to even take a water break.” Instead she started working with a certified pre- and post-natal trainer, Mahri Relin, at her Flatiron District studio Body Conceptions.

“They say you can twist ovaries [during egg retrieval], if you don’t watch the way you work out,” says Monness, who discussed the potential baby-making benefits with Relin before starting classes. “I was so scared.”

After two months of doing relatively gentle workouts with Relin thrice weekly, Monness, founder of blog Mo’ Mommies, got pregnant. Her daughter Tess is now a happy, healthy 8-month-old.

While Relin doesn’t specifically market her classes as helping fertility, New York women looking to conceive are turning to her, and she boasts that at least 30 of her clients have gotten pregnant since she launched her studio in 2012.

“We train people from their wedding to three kids and everything in between,” says Relin, 44. “It’s pretty seamless.”

She says her routine, which highlights barre-based exercises, like wide-stance plies and parallel lunges, stimulates the release of human growth hormone and balances the endocrine system. “There’s significant stress reduction as well,” she says. While yoga and meditation are also thought to reduce stress, Relin says her clients still want classes with a little more oomph.

“It’s not that our workout isn’t difficult, it is — but it’s not constant high-intensity cardio,” says Relin, who charges $150 for private sessions and $32 for group classes. “It’s healthier on the body.”

But experts warn that for women trying to get pregnant, a specific workout routine isn’t the magic bullet.

“In general, exercise improves mood, releases endorphins and improves circulation, but I’m not sure it’s scientifically sound to say it improves fertility,” said Dr. Jordan Metzl, sports medicine physician and author of “Dr. Jordan Metzl’s Workout Prescription.”

“There’s no Holy Grail. I’d suggest finding exercise that you enjoy: doing that will improve your mood and your health.”

But even if Body Conceptions isn’t the secret ingredient to conceiving, fertility doctors say it can’t hurt.

“Any form of exercise increases blood flow dynamics, and that’s good because it improves oxygenation and the delivery of nutrients and hormones and the removal of waste product,” says Dr. Joel Batzofin, a fertility doctor in NYC. “You don’t tell someone who’s trying to get pregnant, ‘Go do a two-hour cardio workout’ — it’s too extreme.”

Regardless, Relin says that using her expertise to boost baby-making is her calling.

“When one of my clients has a baby, it’s incredibly gratifying,” she says. “I feel like we have been part of the process.”