“The Rachel” may have sent countless women to the salon — but Jennifer Aniston’s abs are a truly timeless inspiration.

So it’s no surprise that Dani Coleman — VP of Training at Pvolve and Jen’s own personal trainer — is “in awe” of the 56-year-old star’s core strength, and just generally blown away by what she can do at the gym.

“I’m consistently impressed with her workout standard,” she told The Post.

RELATED: I tried Jennifer Aniston’s go-to Pvolve workout

Jen’s been working with Coleman for four and a half years and raved to Allure that she “absolutely loves” their Pvolve sessions.

“In all the workouts I’ve tried over the years, this one has transformed my body more than any of the others, and it’s a really enjoyable workout that I don’t feel intimidated by, that I don’t dread,” she told People.

So what, exactly, are they doing together?

The Pvolve method has three signature formats, Coleman explained: strength and sculpt, sculpt and burn, and progressive weight training.

“We’re a functional fitness method, which just means we move your bodies in all the ways you do in everyday life — so think front to back, sideways and also rotationally,” she explained. “We use really unique resistance equipment to build overall strength, mobility and stability.”

That equipment includes the P.ball — a combo resistance band/Pilates ball — plus resistance bands, hand weights, a slant board to step on, and ankle weights and bands.

Sessions with Jen are usually 40 minutes to an hour, three times a week — or as much as her schedule allows.

“The most beautiful thing about our sessions is we tap into a little bit of everything,” Coleman went on.

That means cardiovascular exercises, mobility and stability work, and strength training with heavy weights to build lean muscle mass — a big priority for Jen.

“Strength training is the most important thing for women in their 50s,” the actress told Allure. “If you lose muscle, your bones get brittle — osteoporosis. We fall down, we break a hip, and that’s a wrap.”

That certainly doesn’t seem to be a problem she’ll face anytime soon, as anyone who’s seen red carpet photos of her could attest. But her trainer can definitely vouch for her strength, too.

“I’m consistently impressed with her workout standard,” Coleman said. Her core, in particular, is “incredibly strong” and “pretty bulletproof” — Jen hasn’t met a plank she couldn’t finish.

“I put her through so many fun ways to work your core, like standing on one leg, lifting things overhead, crunches on our P.ball or working with our P3 trainer on the mat,” she went on. “But yes, she can hold a plank.

“Her core strength, forever and ever, is something that I am in awe of as her trainer,” Coleman added, but noted that she’s really just “strong head to toe.”

While Jen does her workouts in person, the brand also offers virtual classes — including a bunch with Coleman herself.

But if you want to follow the “Friends” star’s lead, you won’t push yourself to your breaking point.

“She’s really learned to work smarter, not harder,” her trainer said.

“So sometimes she’s like, ‘I have 30 minutes,’ and we pack a punch in those 30 minutes. Other times, if her schedule is really busy, we do a little bit more mobility and a stretch to meet her body where it’s at. And what I value about her is she really values consistency over intensity.”

Jen concurs, telling Women’s Health last year: “I don’t put the pressure on myself like I used to.”

“We think we have to work out for the solid hour and that can be a bit intimidating,” she said. “You really can get an efficient workout with just a good 20 minutes if that’s all the time you have, even 10 minutes of doing something that gets your body moving. I just find comfort in that.”