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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.


Daily and Sport Nutrition




Marni Sumbal, MS, RD, CSSD, LD/N
Board Certified Specialist in Sports Dietetics
Author of
Essential Sports Nutrition
Master of Science in Exercise Physiology
14x Ironman finisher
6 x Ironman World Championship qualifier.
2017 Ironman Chattanooga Amateur Female Champion
Multiple half ironman overall female amateur winner

Are you confused by the many sport nutrition products on the market?

Do you feel overwhelmed by the amount of information on nutrition for athletes?

Are you looking for a better way to fuel your body in order to optimize your athletic performance?

Do you struggle with your relationship with food and your body?


As an accomplished endurance triathlete and Board Certified Sport Dietitian with a Master of Science in Exercise Physiology, Marni is a qualified and experienced expert who can assist you in creating sustainable, healthy eating habits with effective fueling practices to enhance your athletic performance while keeping your body in good health. Through her educational and athletic success, she brings a unique set of skills, knowledge and experience to guide athletes on the path to performance excellence. 


Marni specializes in the following nutrition-focused areas as it relates to athletic performance:

  • Daily nutrition

  • Sport nutrition

  • Vegetarian nutrition

  • Hydration

  • Nutrient timing

  • Reducing/eliminating GI issues

  • Race week/day fueling

  • Meal planning in a busy lifestyle

  • Endurance nutrition and fueling

  • Strategies to improve metabolic and hormonal health

  • Improving your relationship with food and the body

  • Learning how to eat/fuel after overcoming disordered eating or an eating disorder

  • Nutrition to improve immune system health

  • Body composition

  • Sport nutrition products/supplements

  • Analyzing blood work for health and performance improvements

  • Hydration and fueling protocols in different environmental and terrain conditions

Through her comprehensive consultation services, Marni will assess your current nutrition, fueling and hydration habits in order to provide personalized advice to help you meet the nutrition demands of your sport. Through a detailed evaluation of your typical diet, your past and current sport nutrition strategies and training and your relationship with food and the body, Marni can assist you with unlocking any missing links to promote your athletic success. 

Each Trimarni nutrition service will address (as applicable): 

  • Optimal energy intake for dietary sustainability

  • Using real food to nourish the body

  • Nutrient timing and recovery nutrition to adapt well to training

  • Strategies to reduce risk for GI distress during training and racing

  • Hydration and energy needs during training

  • Proper application of sport nutrition products

  • Developing and maintaining a healthy relationship with food and the body

Marni will guide you to achieve a level of performance that may not be possible if you try to do everything on your own. With so much information out there, Marni will help you to navigate your way through all of the science and real world applications to help you achieve performance excellence. 

Proper sport and daily nutrition is not only vital to your athletic success but it's important to eat and fuel well in order to improve your overall health to reduce the risk for disease and illness and to improve quality of life.

Marni will hold you accountable to a real food eating style to support you health needs and will teach you how to use sport nutrition products properly to support your training demands. 

Marni does not believe in “bad” foods, mass marketed meal plans or diet fads. She is a performance-focused sport dietitian who offers safe, realistic and sustainable eating strategies to help you meet your athletic goals while keeping your body in great health.

Are you ready to improve your nutrition habits to take your training to the next level?

Let's get started by selecting the service that would best fit your personal needs. 

$1 of your purchase will go directly to The Greenville Humane Society, which is one of the largest no-kill facilities in the Southeast. Thank you for helping us support our local community to create an environment where all animals are treated with compassion and respect.

Do you want to change your diet, body composition or health?
A Registered Dietitian is the real nutrition expert to help you reach your health, fitness and body composition goals. 

A Registered Dietitian has the the highest level of nutrition counseling. Anyone can call themselves a nutritionist or obtain a certification in nutrition, but only a registered dietitian (RD) has completed multiple years of extensive education and training established by the Accreditation Council for Education in Nutrition and Dietetics (ACEND). In addition to holding a bachelor's degree, a Registered Dietitian must fulfill a specially designed, accredited nutrition curriculum, get accepted into and then complete an extensive 6-10 month supervised internship program of practice (typically 1200 hours) and successfully pass the 3-hour rigorous registration exam. What's more, roughly half of all RDs and RDNs hold graduate degrees and many have certifications in specialized fields, such as sport nutrition, pediatric, renal, oncology or gerontological nutrition.

For athletes, a Registered Dietitian specializing in sport nutrition can provide safe, realistic and practical suggestions to help you create a personalized style of eating that will work for your individual health, body composition and athletic goals. A Board Certified Sport Dietitian has the skills and training to assist in managing health issues, disordered eating, meal planning, energy and fueling requirements and assisting in effective and healthy body composition changes as it relates to fostering performance improvements without sabotaging health. There's nothing more satisfying than having a qualified nutrition expert to work with as it relates to learning how to develop healthy habits for a lifetime of good health and athletic excellence.