Corefirst Pilates, corefirst founders, corefirst photoshoot, corefirst team

About Us

Doniphan Stone, Jeff Heuling, Denver, Corefirst Pilates Founders

Drawing from his own experiences and the challenges he faced overcoming cancer at a young age, Corefirst Co-founder, Doniphan Stone, embarked on a journey to create a solution that would empower individuals to prioritize their health without sacrificing their busy lifestyles. Pursuing this dream, he meticulously crafted the first prototypes from basic fabric store materials in his own home, and has since become an International revolution in the world of Pilates.

From our modest beginnings, Corefirst has turned into a global community of remarkable people who have embraced Corefirst to help them transform their bodies and lives. Our community is the epitome of resilience, dedication and strength- pushing our limits and achieving our goals, while navigating the demands of our everyday lives.

It's our mission to help you elevate "WHY" you want to be healthy, and in the process, create an experience where each movement is infused with purpose and grace. Our approach is rooted in inclusivity, ensuring that everyone, regardless of their background or fitness level, can access the transformative benefits of resistance enhanced Pilates.

Shop Corefirst

We're on a mission to bring pilates to the people and shake the industry to its core.

Doniphan Stone, Jeff Heuling, Denver, Corefirst Pilates Founders

Our Founders

Fueled by action. Ignited by Movement.

Doniphan Stone

Doniphan Stone embarked on his professional fitness journey by establishing his own personal training company immediately after college. Over the years, he has empowered thousands to unlock their greatest potential, guiding them towards healthier, more fulfilling lives. Co-authoring a book on the art of manifesting goals from within, Doniphan offers readers a blueprint to not just chase their dreams, but to thrive along the way.

As the inventor behind the Corefirst system, Doniphan holds several patents, showcasing his dedication to revolutionizing the fitness industry. Today, he proudly stands as the President and Co-Founder of Corefirst. Residing in Denver, Colorado, with his wife, Mia, Doniphan balances his leadership at Corefirst with personal passions. He's an avid Pickleball player, fitness enthusiast, and is deeply committed to his non-profit, which focuses on equipping and empowering individuals.

Jeff Huling

Jeff Huling, a visionary in the world of fitness innovation, has a knack for turning simple ideas into global sensations. As the co-creator of the TRX Rip Trainer and the Nautilus Glute Drive, he transformed garage-born ideas into products with over $25 Million in global sales. His knack for blending traditional techniques with modern design is evident in his every creation.

As the CEO and Co-Founder of Corefirst, Jeffrey's vision drives the brand's commitment to revolutionizing Pilates. Outside the realm of business, Jeffrey cherishes the vibrant life Denver, Colorado, has to offer. Whether it's exploring the Rockies or engaging with the local fitness community, he's deeply rooted in the ethos of the city he calls home.

Press Inquiries

For all press and media inquiries or to request a press kit, please email