Merz Built Fitness began with one mission: to create a space where training, community, and consistency come together to empower every client. Founded by IFBB Pro and Certified Trainer Billy Merz Jr. & His Fiance, Joanna Principato, our Linden-based private facility brings high-level coaching to everyday people in a supportive, no-ego environment.

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Our focus is personalized attention, functional movement, and results-driven programs. Whether you’re here to lose weight, gain strength, or feel your best—we’ve built the foundation for you to succeed.

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Core Values 

• Community First – We’re not just a gym—we’re a family.

• Accountability Always – We walk beside you every step of the way.

• Integrity in Coaching – Certified. Experienced. Passionate.

• Results-Driven Systems – Science-backed training with a human touch.