Endurance Performance Coaching, Sports Nutrition and Bike Fitting Designed to Help You Perform at Your Best
Helping athletes Become Stronger, Healthier,
and More Resilient.
Coaching and Sports Nutrition Consulting Backed by Experience and Science
Most coaches focus only on training.
Most dietitians focus only on nutrition.
Most bike fitters focus only on the bike.
At Trimarni, we do it all.
With more than 20 years of endurance racing experience and professional expertise, we take a fully integrated approach to performance, combining coaching, fueling, and bike optimization to help athletes train smarter, perform stronger, and race with confidence.
Our
Services
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Sports Nutrition
Fuel for performance, health and recovery.
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Bike Fit and Optimization
Precision fitting for comfort, power, and efficiency.
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Training Plans
Strategic programming for your next starting line.
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Coaching
Coaching tailored to your goals and lifestyle.
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Training Camp
Train smarter alongside expert coaching.
Train Smarter. Fuel Better. Perform Stronger.
Let us help you improve your Athletic performance
At Trimarni we combine structured coaching, bike fitting and personalized nutrition to help endurance athletes:
● Improve performance without burnout and minimizing risk for injury
● Nourish the body and fuel properly for training and racing
● Build strength, endurance, and resilience
● Stay healthy while stretching the comfort zone
● Optimize cycling aerodynamics, comfort, speed and power
Our
Team
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Marni Sumbal MS, RD, CSSD, LD/N
Owner and founder of Trimarni
Board Certified Sport Dietitian
Master of Science in Exercise Physiology
Owner of Trimarni Coaching and Nutrition.
3x Author
22x Ironman finisher, 3x XTRI finisher
6x Ironman World Championship finisher. -

Karel Sumbal
Co-owner
Born and raised in Czech Republic. Category 1 cyclist turned endurance triathlete (who loves to mountain bike) with over 25 years’ experience as a skilled bike mechanic and five years as the GM of the Trek Bicycle Store of Jacksonville, FL. RETUL bike fit specialist, bike mechanic extraordinaire and loves good coffee, croissants and chocolate. 18 x Ironman finisher, 5x Ironman World Championship finisher, 3x XTRI finisher. -

Joe Nagy
Assistant Coach
Ironman Certified
3x 70.3 World Championship Qualified (2021, 2025, 2026)
2024 Richmond Marathon - 2:53:09
2x Boston Marathon Qualified (2025 and 2026) -

Sunny
Certified Therapy Dog
What Our Athletes Say