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Greenville, SC

Trimarni is place where athletes and fitness enthusiasts receive motivation, inspiration, education, counseling and coaching in the areas of nutrition, fitness, health, sport nutrition, training and life.

We emphasize a real food diet and our coaching philosophy is simple: Train hard, recover harder. No junk miles but instead, respect for your amazing body. Every time you move your body you do so with a purpose. Our services are designed with your goals in mind so that you can live an active and healthy, balanced lifestyle.


Our Story


Trimarni Coaching and Nutrition is a coaching and nutrition company owned by Boart Certified Sport Dietitian Marni Sumbal MS, RD, CSSD, LD/N and RETUL bike fit extraordinaire, Karel Sumbal.

Marni holds a Master of Science in Exercise Physiology and is 11x Ironman triathlon finisher and 4x Ironman World Championship finisher. She holds a 10:06 Ironman PR. Her husband Karel is a category 1 cyclist turned 7x Ironman finisher, with 2 Ironman World Championship finishes and an Ironman PR of 9:13. He has over 20 years’ experience as a bike mechanic and five years of experience as the GM of the Trek Bicycle Store of Jacksonville, FL. 

Marni and Karel have a combined 18 Ironman finishes, 6 Ironman World Championship finishes and many years of experience, education and knowledge as it relates to endurance training, nutrition, cycling, swimming, mastering endurance racing, sport nutrition and putting on top-notch training camps. 

Marni and Karel are dedicated to helping athletes create healthy habits to achieve athletic excellence. 




... and meet Campy.