Rising Stars: Meet Jennifer Mancini of Calabasas, California

Today we’d like to introduce you to Jennifer Mancini.

Alright, so thank you so much for sharing your story and insight with our readers. To kick things off, can you tell us a bit about how you got started?
Fitness has been part of my life for as long as I can remember, but it wasn’t always about helping other people the way it is now. I competed in fitness competitions through the NPC, did some modeling on the side, and worked as a trainer during that same period — so I was helping clients even back then. But I was a lot younger, and if I’m honest, my goals were different. A lot of it was wrapped up in the number on the scale and how I looked. I could get people results, but it came from a much narrower place than where I coach from today.

In 2010, everything I thought I knew got turned upside down. I was diagnosed with Hashimoto’s disease and rheumatoid arthritis — two autoimmune conditions that don’t care how disciplined you are or how many years you’ve spent in the gym. Suddenly the body I had spent my whole life training didn’t respond the way it used to. The rules I had built my career on stopped applying to me. I had to relearn everything: how to train with inflammation instead of against it, how to listen to my hormones instead of overriding them, how to redefine what “in shape” even meant when your own immune system is working against you.

That experience is what actually shaped me into the coach I am today. I stopped chasing a number on a scale and stopped teaching my clients to chase one either. Now my focus is helping women feel genuinely good in their bodies, not just look a certain way. I work a lot with women in midlife who are navigating perimenopause and menopause, and I go deep with them: bloodwork, hormone panels, peptides, whatever piece of the puzzle they need. It’s a much more complete approach than “eat less, move more,” because for women at this stage of life, that advice usually isn’t the missing piece anyway. If I hadn’t gotten sick, and if I hadn’t had to rebuild my own approach from the ground up, I don’t think I’d coach anywhere near this way today.

For years, I coached exclusively in person. There’s something irreplaceable about being in the room with someone, watching their form, reading their energy, knowing when to push and when to pull back. But in 2023, I made the decision to take my coaching online. I still work with a handful of clients in person, but the majority of my business today is online, which has let me reach women I never would have met inside a single gym in a single city — women in their 40s, 50s, and 60s who are dealing with exactly what I dealt with: a body that’s changing in ways the traditional fitness world doesn’t have great answers for.

Right now, I’m building out the next chapter of that mission, a subscription-based program and app designed for women who want real guidance on training and nutrition through hormonal changes and midlife body composition, without needing full one-on-one coaching to get it. It’s the same philosophy I built my in-person business on, just built to reach more women at once: you don’t have to go back to what worked in your 20s. You have to learn what works for the body you have now.

That’s really the throughline of everything I do. I’m not selling a workout plan. I’m sharing what I had to learn the hard way, that getting sick didn’t end my story in fitness, it gave me the one thing that actually makes me good at this job.

I’m sure it wasn’t obstacle-free, but would you say the journey has been fairly smooth so far?
Honestly, no…..and I don’t think I’d trust anyone who told you their road was smooth.

The autoimmune diagnosis was the biggest one. It wasn’t just a physical setback, it was an identity crisis. My entire career up to that point had been built on being the person whose body always cooperated, I competed, I modeled, I trained other people based on a formula that worked for me. When that formula stopped working on my own body, I had to sit with the very real possibility that I might not get to do this work anymore. Rebuilding wasn’t just about finding new exercises or a new diet, it was about rebuilding my whole understanding of what “healthy” and “fit” even meant, and then figuring out how to turn that into something I could actually teach other people.

The other big struggle has been less personal and more about the business itself. Moving from in-person coaching to building an online business in 2023 meant learning an entirely different skill set. Being a great coach in a room with a client is one thing, building the systems, the technology, and the structure to reach and support women I’ll never meet in person is a completely different job. I’ve had to learn how to build that infrastructure almost from scratch, and that’s been its own steep climb, separate from anything to do with health.

If I’m being honest, I think both of those struggles taught me the same lesson from two different directions: you can’t force your way through with sheer willpower the way I used to think you could when I was competing. You have to actually understand the thing you’re working with, whether that’s your own body or your own business, and build something that works with it, not against it.

As you know, we’re big fans of you and your work. For our readers who might not be as familiar what can you tell them about what you do?
At the core, I’m a one-on-one coach for women over 40, and midlife is really where I specialize, helping women navigate the version of their body that shows up during and after that transition.

What I’ve become known for is going deeper than most coaches are equipped to go. I interpret bloodwork for my clients, I have real knowledge of peptides and how they can fit into someone’s plan, and I use that information to actually build their programming, not just hand them a generic workout and hope for the best. That’s the piece I think sets me apart: I’m not guessing at what a woman’s body needs, I’m looking at the data and building around it.

On the coaching side, I work with clients one-on-one, and I also have a subscription-based program for women who want structure and expertise without full one-on-one coaching. Either way, clients get real strength training programming, cardio routines, and yoga. I’m a certified yoga teacher myself, so that’s not an afterthought, it’s built in. I also write custom meal plans from scratch for every one-on-one client and work with macros, so nutrition isn’t a template either, it’s built around their actual body, their actual bloodwork, and their actual goals.

If I had to sum up what I’m most proud of, it’s that combination, women don’t have to go to five different specialists to get this level of care. I bring the training, the nutrition, the hormone literacy, and the bloodwork interpretation together in one place, built specifically around what a woman’s body is doing at this stage of life.

What sort of changes are you expecting over the next 5-10 years?
I think the biggest shift is going to be AI, without question. It’s already starting to show up everywhere, in how people track their health, in how they get information, in how fitness and nutrition guidance gets delivered. I think we’re heading toward a world where AI is heavily integrated into this industry, and the coaches who lean into that and figure out how to use it are going to be the ones who thrive. The coaches who ignore it or resist it are going to get left behind, not because AI replaces what we do, but because the ones who don’t adapt are going to get buried under the sheer amount of technology moving into this space.

Where I think that leaves someone like me is actually in a good position. AI can help with logistics, with data, with efficiency, but it can’t replace the parts of coaching that come from experience: knowing how to read a client’s bloodwork in context, understanding what peptides actually do in someone’s body, knowing when a woman needs to be pushed and when she needs to be pulled back. My job over the next several years is going to be figuring out how to use AI to handle the parts of the business that don’t need my personal expertise, so I can spend more of my time on the parts that do, actually working with women, one-on-one, on the things that require real judgment and real experience.

Contact Info:

• Website: https://glofit.net/starthere
• Instagram: https://www.instagram.com/glofitbyjennifermancini/
• Facebook: https://www.facebook.com/glofitbyjennifermancini
• Other: https://www.tiktok.com/glofitbyjennifermancini

Image Credits
Photos taken by Michael Helms