I’m Jennifer Aniston’s trainer — forget ‘no pain, no gain,’ these are the most important exercise skills to work on

Jennifer Aniston is done with the “no pain, no gain” mindet.

“That’s not true at all. You can actually have gain with no pain,” she told People earlier this year.

Now her personal trainer has broken down what that means on a practical level, telling The Post which exercises are crucial — and how you can work smarter, not harder to be in your best shape.

“I think gone are the days of no pain, no gain, that mentality,” Dani Coleman — VP of Training at Pvolve and Jen’s own trainer — declared.

“A lot of us come from that more traditional mindset that if it doesn’t hurt the next day, then that workout wasn’t effective. If I don’t kill myself doing an hour and a half of cardio, then that workout wasn’t successful. But that’s just not true,” she said.

“I really encourage women to work smarter, not harder, so you can get a great workout in a shorter amount of time.

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“I think that’s been one of the coolest mindset shifts to see with Jen, is that we don’t have to break our bodies to break a sweat.”

These are four areas that Coleman recommends focusing on to maximize impact without too much strain.

Good form

All your hard work could mean nothing — and end with a injury — if you’re not exercising the right way. Coleman stressed the need to make sure you’re executing efficient form, whether that be online or with a trainer.

Balance and stability

“I didn’t realize how important stability work was until I started training at Pvolve,” she admitted. “It was totally eye opening to me that I had been neglecting that area of training.”

Starting in your 30s, she explained, women see a decrease of lean muscle mass by 3% to 5% every decade.

Beginning is easy — Coleman says building strength by simply standing on one leg is a “solid starting point.”

“There’s been a lot of studies of how that can be a marker for someone’s overall health moving forward,” she said. “You can always start holding onto a chair, a wall, a stable surface, but build up to just holding standing up on one leg for 10 seconds.”

Strength training

You will have to sweat a bit if you want to see results. Coleman is all about lifting — and science backs her up. Studies show strength training burns more fat than cardio, helps prevent osteoporosis, boosts your brain and can even reduce menopause symptoms.

If your goal is to change your body composition, she encourages progressive overload with weights.

“It’s taking those heavier weights at the gym and focusing on executing good form and hitting muscle failure,” she said.

She likes approaching with a “two rep reserve” — meaning you lift until the point when you’d be able to do two more reps in good form.

“Typically it’s lifting a lot heavier than most clients think, and then keeping that weight and scaling up progressively.”

The best part? Lifting keeps working for you even once you put the weights down and go home.

“It’s going to help create more lean muscle mass, which helps combat your insulin resistance. Those things are incredible when we’re talking about our metabolism working more optimized for us,” she said.

The good life

How you spend outside the gym is just as important to what you’re doing inside.

“It’s not just the physical time we’re working out — there are a lot of other components, like your sleep, your hydration, your diet,” Coleman said.

And if you can’t quite make it to the gym, she suggests getting in a little “movement snack.”

“In 10 minutes, you could get a great cardio,” she said. “In 10 minutes, there are wonderful mobility exercises, which I think is something that we really focus on at Pvolve that people overlook.”

Stretching can also make a difference: “Just finding more ways to incorporate daily movement is incredible,” she said.