The Trimarni mission is to help athletes reach performance goals without compromising health. Marni has a great understanding of physiology of the human body during exercise and how food affects a body in motion. She focuses her time helping triathletes and runners learn how to maximize fitness while keeping the body in good health. Marni is well educated in the areas of sport nutrition (for training and racing) and triathlon coaching, exercise physiology and strength training, for athletes of all fitness levels. She specializes in endurance training and sport nutrition, with a great understanding of the metabolic, immune and hormonal stress that occurs when training for a long distance event. Behind every great athlete is a well planned diet - she also helps athletes create great daily nutrition habits to support consistent training. Marni is passionate about helping athletes train smarter in order to reach performance, body composition and health goals faster. Karel is an experienced RETUL bike fitter and bike mechanic and is extremely knowledgeable when it comes to all things bikes and cycling. Marni and Karel coach a team of triathletes alongside providing services to triathletes, cyclists and runners.

About us

Marni holds a Master of Science in Exercise Physiology and she is a Board Certified Sport Dietitian who specializes in coaching and sport nutrition for endurance athletes. She is also the author of Essential Sports Nutrition.

Marni is a 14x Ironman finisher including 4 Ironman World Championship finishes (6x qualifying). She won her first overall amateur female title at 2017 IM Chattanooga.

Marni is a well-known writer and contributes frequently to Ironman, Triathlete Mag, USAT and can be found quoted in other publications like Runner's World, Shape, Women's Running, Fitness and Men's Health.



Karel is an accomplished Cat 1 cyclist turned Ironman triathlete. He was the former general manager of the Trek Bicycle store in Jacksonville, FL and now works at Trimarni Coaching and Nutrition as a coach and RETUL bike fit expert. Karel has successfully completed 12 Ironman distance triathlons and has qualified for the Ironman World Championship five times. He holds an Ironman PR of 9:13 and at 2016 Ironman Mont Tremblant, he clocked the fastest amateur male run split (3:08) of the day.



When Marni and Karel are not working, they can be found cooking/eating, exploring nature, training or spending time with their four-legged furry child Campy.



We welcome emails anytime:

Marni@trimarnicoach.com

Karel@trimarnicoach.com



