About Us
About The Strength Factory
At The Strength Factory, we believe fitness should empower everyone. Located in Superior, Wisconsin, our gym is more than a place to lift weights - it’s a supportive, body-positive community that celebrates strength in all forms. As a female-owned and operated facility, we take pride in creating a welcoming space where inclusivity and confidence thrive.
Our mission is simple: to help every client discover an enjoyable path to a healthier, happier life. Whether you’re new to fitness or an experienced athlete, our functional training programs are designed to build strength, mobility, and endurance that translate into real-world results.
We’re passionate about education - providing each client with the knowledge, tools, and motivation to live a healthier life. Our goal is to build a community committed to elite functional fitness through guidance, support, and connection.
The Strength Factory is proud to partner with local organizations like Harbor City Roller Derby, helping athletes perform at their best through strength, stability, and teamwork.
If you’re looking for a place where fitness meets empowerment, community, and fun - you’ve found your home at The Strength Factory.
Our Team
Kelly Keller
I founded The Strength Factory with one goal in mind — to build a space where strength goes beyond the physical. Here, we move with purpose, lift each other up, and grow together as a community.
I’m a coach, entrepreneur, mom, and motivator who believes that fitness should empower every part of your life — mind, body, and heart. Whether it’s kickboxing, kettlebells, yoga, or Saturday morning circuits, my mission is to help people discover what they’re capable of — and to remind them that they don’t have to do it alone.
At The Strength Factory, we celebrate progress in every form. We cheer for the small wins, push through the hard days, and create a space where everyone feels seen, supported, and strong.
When I’m not at the gym, you’ll find me juggling family life, real estate, and a good cup of coffee — all while dreaming up new ways to bring people together through movement and mindset.
Karen Shelton
I’m a mental health therapist, trauma-informed yoga teacher, and nationally certified sign language interpreter — roles that allow me to blend compassion, expertise, and lived experience in everything I do at The Strength Factory. As a mother, daughter, sister, friend, and advocate, I believe deeply in connection — to ourselves, to others, and to the communities we build together.
Beyond my professional life, I’m a writer, reader, indoor gardener, chicken keeper, singer, dancer, and lifelong learner. My work is grounded in empathy, inclusion, and the belief that healing and strength can take many forms.
At The Strength Factory, I strive to create space for movement, healing, and growth — helping each participant find strength in body, mind, and spirit.
Jess Duffy
I live right here in Superior and absolutely love everything this area has to offer. When I’m not in the gym, I’m probably out on Lake Superior, hiking our local trails, or planning my next travel adventure on a patio with a craft beverage in hand.
I believe working out is one piece of a balanced life. Fitness shouldn’t be about perfection or punishment, it’s about energy, movement and fun. My favorite way to teach is through high-intensity, full-body workouts that challenge you to dig deep and celebrate what your body can do. Life moves in seasons, and I want my classes to be a space where you can work hard, have fun, and feel grounded no matter where you’re at.
Can’t wait to see you in class!