Strength, Community, and Purpose
Stallion Fitness was built from the ground up, not just as a gym, but as a place of opportunity, resilience, and respect. Founded by Sean Antwan, a Chaldean American who immigrated to the U.S. after years of hardship, Stallion is a reflection of his journey and the values that carried him forward: hard work, family, and the pursuit of health.
What began as free outdoor classes and one-on-one training during the early days of COVID-19 has now grown into a full-service private gym with locations in El Cajon and La Mesa. Every inch of the space was designed with care and state-of-the-art equipment, certified personal trainers, and a no-judgment atmosphere where members feel safe, respected, and motivated.
We're proud to offer memberships, personal training, and a curated selection of supplements through our in-house Stallion Shop But above all, we're proud to be part of a fitness community that uplifts each other and makes health a priority; regardless of where you start.
Join Stallion Fitness
Built for the Community
With two Stallion Fitness locations, you're never far from a supportive, no-pressure gym environment. Whether you're lifting for the first time or chasing a new PR, Stallion Fitness is built for accessibility and comfort. Each gym is fully equipped, trainer-supported, and designed so every member feels welcome.
El Cajon
450 Fletcher Pkwy #109
El Cajon CA 92020 (619) 270-7908 stallionarena@gmail.com Google Maps DirectionsLa Mesa
8227 La Mesa Blvd
La Mesa CA 91942 (619) 467-7457 stallionarenalamesa@gmail.com Google Maps Directions
What Sets Stallion Fitness Apart
Community-Focused
We've built Stallion Fitness to be welcoming and respectful. Whether you're brand new or a seasoned athlete, you'll feel supported by our members, trainers, and environment.
Private & No-Pressure
Unlike commercial gyms, Stallion is designed for privacy and peace of mind. No staring and no judgment, just a clean space to focus and grow.
Expert Trainers
Our trainers don't just work here, they're part of the community. Every coach is certified and handpicked for their ability and passion to help you succeed.
Full-Service Support
From personal training to supplements, memberships to group sessions — we offer a full approach to health and strength, all under one roof.
Meet the amazing team behind Stallion Fitness
Sean Antwan
CEO | Personal Trainer
Background
With 10 years of experience as a professional fitness trainer, my passion is guiding people toward healthier lifestyles by honoring the fact that every body is unique, with its own strengths and limitations. I create customized plans built around your health, schedule, and personal goals so you can progress in a way that truly fits your life. Beyond coaching clients, I love mentoring up-and-coming trainers and helping them become the best coaches they can be, both in skill and in the impact they make.
Certifications
- Fitness Nutrition Coach
- Sports Injury Specialist
- Physique and Figure Specialist
- Heart Rate Performance Specialist
- Biomechanics Specialist
- Lifestyle Weight Management
- Core Conditioning Specialist
Sandra Rafo Antwan
Owner | Personal Trainer
Background
I’m passionate about helping others feel good in their bodies and find genuine happiness through movement and healthy habits. To me, wellness is more than lifting weights—it’s about mobility, nourishing foods, quality rest, and discovering what your body can achieve with consistent effort. My goal is to guide you toward a balanced, fulfilling lifestyle where you feel strong, confident, and fully supported.
Certifications
- NASM
- ISSA
Ryan Balderas
Personal Trainer
Background
My own transformation—from growing up overweight to becoming healthy—led me to study nutrition and exercise so I could help others navigate their own journeys with confidence and clarity. I specialize in body recomposition, weight loss, strength training, and circuit training, using these tools to help clients build sustainable habits, grow stronger, and feel truly supported. Inside the gym, I’m driven by watching people gain strength and confidence, and outside the gym, I’m committed to becoming the best version of myself so I can show others what’s possible.
Certifications
- ACE Certified Personal Trainer — American Council on Exercise
Logan
Personal Trainer
Background
I’m a dedicated personal trainer committed to helping clients build strength, improve confidence, and achieve sustainable results through personalized, motivating, and enjoyable training sessions.
Anthony
Personal Trainer
Background
I’m a dedicated personal trainer committed to helping clients build strength, improve confidence, and achieve sustainable results through personalized, motivating, and enjoyable training sessions.
Christian
Personal Trainer
Background
I’m a dedicated personal trainer committed to helping clients build strength, improve confidence, and achieve sustainable results through personalized, motivating, and enjoyable training sessions.
Nesthy Pamelar
Personal Trainer
Background
Growing up in sports and overcoming challenges taught me resilience, and discovering my passion for fitness showed me that personal training is my way to truly help others. I believe training goes far beyond reps—it’s about mindset, confidence, and growth—and I’m committed to creating a supportive, family-like environment where clients feel empowered to become stronger mentally, physically, and emotionally. Whether through strength and conditioning, athletic training, or body recomposition; my mission is to guide you, support you, and help you become the version of yourself that younger you would be proud of.
Certifications
- Mesa College Personal Trainer (ACE)
De Anza
Personal Trainer
Background
I’m a dedicated personal trainer committed to helping clients build strength, improve confidence, and achieve sustainable results through personalized, motivating, and enjoyable training sessions.
Sean Antwan
CEO | Personal Trainer
Background
With 10 years of experience as a professional fitness trainer, my passion is guiding people toward healthier lifestyles by honoring the fact that every body is unique, with its own strengths and limitations. I create customized plans built around your health, schedule, and personal goals so you can progress in a way that truly fits your life. Beyond coaching clients, I love mentoring up-and-coming trainers and helping them become the best coaches they can be, both in skill and in the impact they make.
Certifications
- Fitness Nutrition Coach
- Sports Injury Specialist
- Physique and Figure Specialist
- Heart Rate Performance Specialist
- Biomechanics Specialist
- Lifestyle Weight Management
- Core Conditioning Specialist
Sandra Rafo Antwan
Owner | Personal Trainer
Background
I’m passionate about helping others feel good in their bodies and find genuine happiness through movement and healthy habits. To me, wellness is more than lifting weights—it’s about mobility, nourishing foods, quality rest, and discovering what your body can achieve with consistent effort. My goal is to guide you toward a balanced, fulfilling lifestyle where you feel strong, confident, and fully supported.
Certifications
- NASM
- ISSA
De Anza
Personal Trainer
Background
I’m a dedicated personal trainer committed to helping clients build strength, improve confidence, and achieve sustainable results through personalized, motivating, and enjoyable training sessions.
Hannah
Personal Trainer
Background
I’m a dedicated personal trainer committed to helping clients build strength, improve confidence, and achieve sustainable results through personalized, motivating, and enjoyable training sessions.
Alexandra
Personal Trainer
Background
I’m a dedicated personal trainer committed to helping clients build strength, improve confidence, and achieve sustainable results through personalized, motivating, and enjoyable training sessions.
Whitney Midelton
Personal Trainer
Background
I grew up playing sports, competed in college soccer, and later spent much of my 20s backpacking—movement has always been my foundation and a reminder that I can do hard things. My experience in team sports and years coaching small-group HIIT, strength, and technical sessions fuel my passion for motivating others and helping them discover their own resilience. I’m always here to listen, answer questions, and guide you through the learning process—be kind to yourself, honor your body, and let’s use it well.
Certifications
- Personal Training (ACE)
- Correctional Exercise Specialtist (NASM)
Izzy
Personal Trainer
Background
I’m a dedicated personal trainer committed to helping clients build strength, improve confidence, and achieve sustainable results through personalized, motivating, and enjoyable training sessions.
Monica
Personal Trainer
Background
I’m a dedicated personal trainer committed to helping clients build strength, improve confidence, and achieve sustainable results through personalized, motivating, and enjoyable training sessions.
Reccy Abilar
Personal Trainer
Background
I grew up watching my mom—an inspiring coach and NPC Bikini competitor—balance strength, health, and raising six kids, and she’s the reason fitness became such a meaningful part of my life. Lifting has always been my therapy, and now I use that passion to help others feel confident, motivated, and supported in their own journeys. Everything I do is for the people I care about, and I’m committed to bringing that same energy and dedication to every client I work with.
Certifications
- ISSA
What Our Members Are Saying
With over 160 five-star reviews across our El Cajon and La Mesa locations, Stallion Fitness is trusted by real members getting real results. Don't just take our word for it, hear what they have to say.
“Such a great gym! They've recently expanded and it looks so good! Lots of equipment and space, it's not crowded like commercial gyms are, and it's very clean and well-kept. Sean is an amazing trainer - motivating, educated, and super friendly. 10/10 recommend Stallion Arena :)”
Lauren V. Member“The best gym experience I've ever had. I have struggled with weight loss my entire life. When I met Sean at Stallion he coached me in a way that worked best for me. In 6 months I lost 35 lbs. Sean is an amazing trainer. Knowledge, professional and friendly. The staff and the gym members are great. Such a great vibe.”
Steve M. Member
Gear Up. Stay Fueled.
From performance supplements to everyday gym gear, the Stallion Shop is your source for essentials to support your training. Order online or shop in person at our El Cajon location, whatever fits your routine.
All Products