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We welcome your thoughts, experiences, comments, suggestions, questions or personal stories. If you don't hear from us right away, we promise we are not ignoring you. We're likely training, sleeping, working, walking Campy or in the kitchen, but your email is very important to us. Please allow at least 24 hours for us to professionally respond to your email.


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.

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Our Story

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

Marni holds a Master of Science in Exercise Physiology and is 19x Ironman triathlon finisher, 3x XTRI finisher and 6x Ironman World Championship finisher. She holds a 10:06 Ironman PR and she was the overall female amateur at 2017 Ironman Chattanooga and overall female winner at 2024 IM 70.3 Louisville.

Karel is a category 1 cyclist turned 16x Ironman finisher. He has completed 4x Ironman World Championship events and has an Ironman PR of 8:59 (achieved at the age of 47!). Karel 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. Karel is extremely passionate about cycling.

Marni and Karel have a combined 36 Ironman finishes, 9 Ironman World Championship finishes and countless years of formal and personal experience, education, instruction and knowledge as it relates to endurance training, nutrition, cycling, swimming, endurance racing, ultra distance training, sport nutrition and coaching.

This duo is dedicated to helping athletes achieve athletic excellence while maintaining great physical and mental health. 

Marni and Karel also have a great love of the outdoors, nature and animals. They love to travel and they crave adventure. At home, they share their house with their furry family of rescules: Madison (~16-year old cat), Ella (5-year old cat), Sylvi (4-year old cat), Asher (3 year old cat) and the latest addition, Mia (~3 year old cat).
Campy crossed the rainbow bridge on July 18th, 2024 at the incredible age of 17 yrs and 3 months.

Meet the FACES BEHIND TRIMARNI

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Assistant Coach Joe Nagy.

Trimarni coach Joe Nagy and owner of Prov.3N Performance.

... and meet Campy.

... and meet Campy.

 
Trimarni assistant and camp/SAG support Joey Mock.

Trimarni assistant and newsletter contributor Joey Mock, RD, LD/N.