Jennifer Aniston Slams This 1 Health Mantra as ‘Not True at All’: ‘I Always Had the Message in My Brain’ (Exclusive)

Jennifer Aniston does not abide by one popular health mantra.

"No pain, no gain. That's not true at all," the actress, 55, tells PEOPLE in an exclusive interview. "You can actually have gain with no pain."

Detailing that her understanding of health and fitness has evolved over the years, as she has picked up routines and different tips and tricks along the way, Aniston says, "I know more, because I've tried it all."

"And my big takeaway is, 'Boy, you didn't have to hurt your body so much back then. You didn't need to beat yourself up,' " she continues.

Jennifer Aniston Shares the Workout That Has 'Transformed My Body' — Plus the Drink She Has Every Morning (Exclusive)

According to Aniston, the "no pain, no gain" idea that so many follow within the fitness world was something she originally believed as well.

"I always had the message in my brain," The Morning Show star explains. "You gotta do 45 minutes of cardio, then floor work and then weights."

But, through her ongoing partnership with Pvolve, a low-impact fitness program, Aniston says she has discovered a newfound appreciation for workouts — and how they don't have to be painful.

"You can actually enjoy your workout, not break your body and have an incredible transformation," she says. "In all the workouts I've tried over the years, this one has transformed my body more than any of the others."

Jennifer Aniston on Her Approach to Self-Care, Exercise & Nutrition: 'I Always Give Myself a Cheat Day' (Exclusive)

One other thing that Aniston doesn't believe in, she says, is making New Year's resolutions — including health-related ones.

"I'm not a good person to ask about that. I don't make resolutions," the star tells PEOPLE. " I really don't. I don't want to let myself down. I don't want to fail at that."

Instead pointing to Pvolve's “strength redefined” New Year challenge, Aniston says that is something others can get behind instead of making a 365 days-long resolution. "You are not giving yourself up for the next year," she says.

"If you only can make it for two of those weeks, and it doesn't work for you, it doesn't work," adds the Friends alum. "But I guarantee you, you won't. You'll get the bug. Everybody I've spoken to, people just get the bug, and they just love it."