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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 14x Ironman triathlon finisher and 4x Ironman World Championship finisher (6x qualifier) She holds a 10:06 Ironman PR and she is the overall female amateur at 2017 Ironman Chattanooga. Her husband Karel is a category 1 cyclist turned 12x Ironman finisher, with 3 Ironman World Championship finishes (5x qualifier) and an Ironman PR of 9:13. He consistently runs one of the top amateur male run times at most Ironman distance events. He has over 20 years’ experience as a bike mechanic and formally, five years of experience as the GM of the Trek Bicycle Store of Jacksonville, FL. 

Marni and Karel have a combined 26 Ironman finishes, 10 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 achieve athletic excellence while maintaining great physical and mental health. 




... and meet Campy.