In the case of Pvolve, the program is designed to go beyond targeting only big muscle groups, such as our glutes and quads, and extend into those micro muscles that wrap around our bones and keep them strong as we age. “My mom and dad lived really long lives into their 90s, but when my mom was 80, she just wasn’t mobile,” Aniston (pictured above with Pvolve’s founder, Rachel Katzman) reflects. “Physically, they didn’t have a joyful end, so it’s something I’m really glad I’ve truly taken a hold of.”

This is also where Pvolve’s Longevity Report is impactful. With its launch, it also introduces Pvolve’s Muscle Readiness Score, a first-of-its-kind index that measures how prepared women’s bodies actually are for aging. Also, several fairly staggering stats. (For example, 78 percent of women say strength training matters for long-term health; but 60 percent aren’t doing it in a typical week.)

“I was told about [the value of strength training], I just didn’t listen,” Aniston says. “With Pvolve, I love that weights are incorporated into every workout, so if I have 10 minutes or if I have 20 minutes or if I have an hour, we will just hit every muscle group and every part of the body. It’s really just about getting [a workout] in and making a commitment to yourself to do it.”

And on the days that Aniston doesn’t feel like working out? She says she listens to her biggest cheerleader: Herself. “I say, ‘You’ll feel better, just do it. You can do anything for 40 minutes, 30 minutes—even 10 minutes,’” Aniston says. “I also always give myself a little bit of an out. Like, if I do it for 5 minutes and feel awful, I can just stop.” But once her workout clothes are on, she says it kicks her investment level up a notch. “On the other side, it’s always worth it. I try to remind myself, ‘Just remember how great you’re going to feel.’”