Forge
Our strength training program is designed to do more than just build muscle—it’s here to transform how you move, feel, and live. With expert coaching, personalized guidance, and a focus on proper form, you’ll train smarter and get stronger—physically and mentally. Whether you’re lifting for the first time or chasing your next PR, our community-driven approach helps you push limits, stay accountable, and unlock your full potential.
Strength That Serves You Outside the Gym
We’re not just training for reps—we’re training for life. From carrying groceries to improving posture and joint health, our strength program is built to enhance how you live every day. Fortitude Gym helps you move better, feel stronger, and show up powerfully in every part of your life.
Progress You Can Feel—and Track
With smart programming and consistent coaching, you’ll see measurable gains in strength, endurance, and confidence. Our team tracks your progress, adjusts your plan, and celebrates every upgrade—because here, your results matter.
“I first met Katie at the gym where she was teaching, and it didn’t take long for me to realize she was one of the most energetic and motivating trainers I’d ever worked with. Her workouts were always challenging but fun, and she had a way of pushing you to be your best without ever making it feel intimidating. Over time, we became close friends, and I got to see firsthand just how passionate she is—not only about fitness, but about helping people feel strong, confident, and empowered. Katie pours her heart into everything she does, and I couldn’t be more excited to see her open her own gym. Anyone who trains with her is in amazing hands!”
Stefanie M.
“I've had the incredible privilege of training with Katie Duffy for over five years, and she has been absolutely instrumental in building my fitness foundation from the ground up. Her expertise goes far beyond just prescribing workouts; she has a remarkable ability to scale difficulty precisely, ensuring that I'm always challenged while meticulously prioritizing my safety and keeping me injury-free. This thoughtful approach has been key to my consistent progress and long-term health.
The results I've achieved under Katie's guidance speak for themselves: I've added a remarkable 100 lbs to my squat max and an impressive 75 lbs to my bench max. Beyond strength gains, I've also transformed my physique, dropping 25 lbs and reducing my body fat percentage by 7%. These aren't just numbers; they represent a significant improvement in my overall health and confidence.
What truly sets Katie and her new gym apart is the palpable emphasis on building community. It's more than just a place to work out; it's a space where genuine connections are forged between members. This vibrant atmosphere means that no matter how tough the workout looks on paper, I'm genuinely excited to get to the gym. It's a testament to Katie's vision that she's created an environment where support, encouragement, and shared goals thrive, making every session something to look forward to.”
Brian M.