About Calvin B. Mardembrough Jr.

Discipline. Passion. Results.

Calvin B. Mardembrough Jr. isn’t just an athlete — he’s the embodiment of what it means to turn persistence into progress. Born and raised in St. Maarten, Calvin’s journey into bodybuilding began with a simple desire to better himself. What started as a personal pursuit of fitness evolved into a life mission to inspire others to reach their highest potential — inside and outside the gym.

An ISSA-certified personal trainer and a decorated Men’s Physique competitor, Calvin has proudly represented St. Maarten on international stages including the NPC Ultimate Grand Prix in Boca Raton, Joe Weider’s Olympia Latino America in the Dominican Republic, and the Caribbean Grand Prix in the Bahamas. Across multiple seasons, he has earned gold, silver, and bronze medals, consistently placing among the region’s top athletes.

Calvin’s accomplishments aren’t just measured in medals — they reflect an unwavering work ethic and mindset built on consistency, faith, and resilience. His 2025 season, marked by over 197 consecutive days of preparation, showcased not only physical strength but also mental endurance and professionalism. Competitors, judges, and fans alike have come to recognize him for his humility, focus, and genuine sportsmanship — qualities that define both his athletic and coaching career. His impressive record—collecting gold, silver, and bronze finishes—cements his reputation as one of the Caribbean’s most disciplined competitors.

Today, Calvin channels that same drive into helping others achieve their own fitness goals through Gym Magnet Fitness, though his personalized coaching platform.

The philosophy that Calvin holds dear is simple but powerful:

“Your transformation starts the moment you stop doubting what you’re capable of.”

Through tailored programs built around each client’s goals, lifestyle, and experience level, Calvin focuses on sustainable progress — combining innovative training techniques, balanced nutrition guidance, and mindset coaching. His clients learn to build not just stronger bodies, but stronger habits and self-belief.

Whether you’re stepping into the gym for the first time or aiming to push past your next performance plateau, Calvin brings the expertise of a professional athlete and the heart of a mentor. His approach is grounded in discipline, accountability, and purpose, making every session an opportunity for growth.

When he’s not competing or coaching, Calvin remains a proud ambassador for his island, continuing to bring recognition to St. Maarten’s growing fitness community. His journey stands as proof that with focus, faith, and the right guidance, transformation isn’t just possible — it’s inevitable.

Welcome to Gym Magnet Fitness — by Calvin Mardembrough Jr

Where passion meets precision, and your journey begins with purpose.