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 22x Ironman triathlon finisher, 3x XTRI finisher and 6x Ironman World Championship finisher. She holds a 10:01 Ironman PR and she was the overall female amateur at 2017 and 2024 Ironman Chattanooga and overall female winner at 2024 IM 70.3 Louisville.
Karel is a category 1 cyclist turned 18x Ironman finisher and 3x XTRI 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 completed over 40 Ironman events, 6 extreme triathlon events and have 9 Ironman World Championship finishes between them both. They also have 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 rescues:: Ella, Sylvi, Asher, Mia and Sunny.
Campy (Marni’s soul dog) crossed the rainbow bridge on July 18th, 2024 at the incredible age of 17 yrs and 3 months and Madison (cat) passed away 12 weeks later, at the age of 16.
