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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.



We realize that no two athletes are alike. We all have different health and fitness goals, we live different lifestyles and we all come from different athletic backgrounds.

Above all, we believe in a TEAM structure with our coaching in that every athlete supports one another. But, as coaches, we treat every one of our coaching athletes as individuals, each with a personalized training plan.  It is our goal to help you train smart so that by race day, you have the skills, fitness and mental strength to execute with a healthy and well-fueled body.  We never want you to feel as if training takes over your life but instead, it is part of your lifestyle.

Between us both, we have successfully finished 24 Ironman triathlons and have qualified have participated in the Ironman World Championship six times. We understand the physical demands of endurance racing and the training needed to properly prepare for an endurance event. No matter what level athlete you are, we want to be part of your training and racing journey.

Marni is a Board Certified Sport Dietitian (CSSD), 14x Ironman finisher and holds a Master of Science in exercise physiology. She is the author of Essential Sports Nutrition. She specializes in sport nutrition and she is a certified USA Triathlon coach. With a great understanding of the physiological and nutritional requirements of training for endurance sports, she enjoys working with triathletes and runners of all levels. She has coached fitness enthusiasts to become Ironman finishers and has helped many age-groupers reach personal best times and achieve life-long fitness goals. She has also helped many athletes improve dietary habits to reach health goals and with an extensive background in sport nutrition, she has helped countless athletes feel confident for race day with a solid race day fueling plan, backed by a healthy diet. 


Karel is an experienced RETUL bike fitter with exceptional skills as a bike mechanic. As a cat 1 cyclist turned triathlete, Karel has the ability to think like a cyclist and triathlete in order to help Trimarni athletes learn how to bike smarter as it relates to gearing, cadence, power, bike fits and pacing. Karel is a 9x Ironman finisher and has competed in the IM Kona twice since becoming a triathlete in 2012. He is currently training for his third IM Kona.

Marni and Karel share coaching responsibilities with the Trimarni team in that they both help athletes overcome challenges, push their limits and discover what is possible with the human body.

We enjoy the developmental process of working with athletes and teaching our athletes how to train smarter in order to race harder.  We provide great detail and attention to every workout which includes focus on strength training, daily and sport nutrition, pacing, intervals, mental toughness, recovery and learning how to adjust to all obstacles. 

Always thank your body for what it allows you to do on a daily basis and never become too focused on the end result that you lose sight of the training journey, which comes with many life lessons.   

Thank you for considering Trimarni Coaching to help you reach your short and long term triathlon goals. 

After reviewing the individual coaching categories, we encourage you to read the commonly asked questions on the bottom of this page to ensure that Trimarni is the right coaching company for your needs. 


"Don't lower your expectations to meet your performance. Raise your level of performance to meet your expectations. Expect the best of yourself, and then do what is necessary to make it a reality." 

- Ralph Marston


Individual Coaching
Delivery of workouts (written by Marni and Karel) Every 3-4 weeks Every 2-3 weeks Every 1 -2 weeks
Annual Training Plan Training built around race schedule, submitted in December. Athlete must give a one-month notice of a change in race schedule Training built around race schedule, submitted in December. Athlete must give a two-week notice of a change in race schedule Training built around race schedule, submitted in December. Coaches will modify training for any modifications in race schedule, anytime./td>
Workout modifications No modifications Modifications every 2 weeks, monitoring development As needed modifications, monitoring development
Gadgets Required HR monitor/GPS watch, basic features HR monitor/GPS watch (advanced features), Bike Power meter highly encouraged HR monitor/GPS watch (advanced features), Bike Power meter highly encouraged
Workout feedback (email, phone, skype, facetime) 1x/week from assistant coach Joe 1x/week from Marni and Karel 2-3x/week from Marni and Karel
Initial consultation prior to coaching No No Yes
Weekly “check-in” emails and videos Yes Yes Yes
Access to private Trimarni Coaching Facebook page Yes Yes Yes
Training Peaks®
Training Peaks® review 1x/week from assistant coach Joe 1x/week from Marni and Karel 2-3x/week from Marni and Karel
Training Peaks® account Basic Basic Basic, Premium encouraged
Testing (Check-points)
Testing Testing provided throughout season, assistant coach Joe will establish zones throughout season Testing provided throughout season, Marni and Karel will establish zones throughout season Testing throughout season, Marni and Karel will establish zones, monitor progress and provide specific feedback
Strength and Recovery
Strength and Recovery Periodized strength training included in training plan, with videos Periodized strength training included in training plan, with videos Periodized strength training included in training plan, with videos, modifications as needed
Nutrition Nutrition and sport nutrition education provided throughout entire season Nutrition and sport nutrition education provided throughout entire season. One key race fueling guidance Nutrition and sport nutrition education provided throughout entire season. All key races will include fueling guidance
Race Execution
Race Planning Education provided throughout entire season on specific races, skills and strategies for all types of race courses. Questions encouraged for future check-in email/video topics. Race results shared in check-in email. Education provided throughout entire season on specific races, skills and strategies for all types of race courses. Questions encouraged for future check-in email/video topics. Files will be reviewed after races with feedback after key races. Race results shared in check-in email. Education provided throughout entire season on specific races, skills and strategies for all types of race courses. Questions encouraged for future check-in email/video topics. Files will be reviewed after races with feedback after key races. Race results shared in check-in email.
Additional Services
RETUL bike fit $20 discount $50 discount $75 discount
Gear & Camps
Trimarni Training Camps Discounts available Discounts available Discounts available
Other Benefits
Sponsors discount Discounts available Discounts available Discounts available
Price $150/month $210/month $300/month

The 2019 Trimarni Coaching application period was open from September 28th until October 12th.
To be part of the Trimarni team as a one-on-one athlete, we only accept new athletes once a year.

If you were unable to be part of one-on-one coaching but would like to be part of the Trimarni team, consider a Trimarni training plan and being part of our educational team.

Educational Team

Do you like what you read or hear from Trimarni on social media? Do you believe in the Trimarni method of coaching and nutrition? Do you want a trusted source to ask questions to and to learn? If you said yes, you are the perfect athlete for our educational team. 

For only $35/month, you will receive our weekly “check-in” emails which cover topics like sport nutrition, daily nutrition, race strategies, motivational tips, mental skills, mobility work, strength training, tapering, post race tips, travel tips and so much more! You will be able to ask questions, watch weekly FB live videos and learn from coach Marni and Karel. You will also be able to join our private Trimarni Coaching Facebook page, which is a resource for our athletes for non-stop motivation and for asking questions and you have access to all of our Trimarni sponsor and affiliate discounts. You can cancel your $35/monthly payment anytime, with a 30-day notice. We ask for a 3-month minimum when signing up for the educational membership.  

Trimarni ATHLETE Alumni Program

Trimarni Alumni program - $150/year

The coach-athlete relationship is a special one and at Trimarni, we believe you are more than just an athlete and we are more than just “workout writers”. As a Trimarni athlete, we share your life with you. You willingly let us into your life and we get to know you and your family/friends/kids. We share lots of ups and downs together and you confide in and trust us, as your coaches.

We realize that over a period of time, life changes and you may no longer need us as your coach. However, once a Trimarni, you are always part of our family. While you may no longer be a one-on-one athlete, we want to make sure that you have the opportunity to keep your Trimarni athlete identity. 

An important focus for the continued growth of Trimarni is maintaining a connection with our past athletes. With the Trimarni coaching alumni program, we allow our recent coaching athletes to remain connected to their teammates and build new Trimarni friendships.

As a recent Trimarni athlete, we would like to offer you the opportunity to stay part of the Trimarni team.
For only $150/year, you will receive the following:
-Access to the Trimarni team private Facebook page
-Access to weekly Trimarni team Facebook live chats
-Weekly educational check-in emails
-$100 discount off one Trimarni camp
-$50 off one 2018 Trimarni half or full IM distance training plan
-Access to Trimarni sponsor/kit discounts
-Continued and new Trimarni friendships

-You have been coached one-on-one by Trimarni for 2+ years.
-You are not working with another coach/coaching company.

We look forward to keeping you part of the Trimarni family.


Commonly asked questions

1) How do I know what level coaching I should select?

Advanced athlete - with assistant coach Joe
-We design your training to fit into your life, to ensure that your training fits into your work, life and family schedule. Your training is designed with your key races as priority so that you develop and peak appropriately.
-We are focused on your overall development, however you will not receive coaching assistance throughout the season.
-Anytime in your season, you will be able to ask questions via email to, where general questions will be answered back to you via email but for more specific topics, those will be covered in future check-in emails or videos.

This coaching service is ideal for:
-The athlete who does not need coaching assistance – all you need is a smart, well-designed training plan that fits into your life and helps you train effectively throughout the season to ensure that you peak appropriately.
-The athlete who is also a coach and does not want to write your own training plan.
-The athlete who has experience following a training plan or is looking for a different style/structure of training.
-The athlete who has great self-management, knows how to modify training, move around workouts and is not injury prone.
-The athlete who is interested in our style of coaching and will likely advance to a higher coaching service in 2018.

This coaching service is not ideal for:
-Newbie/inexperienced athletes
-Injury prone athletes
-Athletes with a complicated life/work schedule, which often requires modifications in training
-The athlete who needs accountability and feedback

Excel athlete - with coach Marni and Karel
-We are dedicated to your overall development and we want to monitor your progression as much as possible.
-We want to help you optimize your athletic performance and we will give you our full attention and support, whenever you need us, along the way. 
-We will be available to you throughout your season, via email, text, phone, Facetime/Skype, anytime you need us.
-We value a long-term relationship as we are invested in your short and long term goals.

This coaching service is ideal for:
-The athlete who wants a close coach/athlete relationship - we will play an integral in your life, we are invested in you as our athlete.
-The athlete who desires constant feedback, accountability, support, education and monitoring.
-The athlete who is extremely dedicated and is willing to make the necessary investments to excel in triathlon.
-The athlete who constantly struggles with consistency and requires a very individualize training plan, that often needs adjustment. 
-The athlete who is coming off an injury in 2016.
-The athlete who is all-in and is excited to take the next step with Trimarni coaching.


Succeed athlete - with coach Marni and Karel
-This is our most popular coaching level.
-We design your training to fit into your life and we build your training around your 2017 race schedule.
-We value a long-term relationship as a succeed athlete, and we want to help you reach your short and long term goals.
-We monitor your training on a weekly basis to ensure that you progress effectively throughout the season. While you may not always hear from us throughout the week, we are "watching" you to ensure that you are properly developing. 
-We are focused on your overall development and we will monitor your progression throughout the season.

-If you do not fit into the Advanced or Excel category, you will get everything that you need as an athlete, from us as your coaches, as a Succeed athlete.

2) Why don’t you coach runners or cyclists? 

Although running and cycling are part of a triathlon, they are two completely different sports (compared to triathlon) with different styles of training and physical requirements, relating to pacing, execution and nutrition. With a combined 17 successful Ironman finishes, including 6 Ironman World Championship qualifications and over 20 half ironman distance triathlon finishes, including several male and female overall amateur wins, Marni and Karel are elite endurance triathletes who specialize in coaching endurance triathletes.

It’s important that athletes understand that when you are a triathlete, you are training for the sport of triathlon. All of our education, focus and passion is dedicated to the sport of endurance triathlon (half and full distance triathlons). Long distance triathlons may not be a new sport but the sport of triathlon is changing and evolving. We keep up with current research, trends and training methodologies and we have a few experienced mentors for guidance. All of which ensures that our athletes receive the best style of triathlon training possible, every race season, with confidence that we are 100% invested into the sport of triathlon as full-time triathlon coaches. 


3) Am I allowed to run a marathon, even though I am training for a triathlon?

While we don’t mind if you participate in a running race (5K-half marathon) as it can be nice to break up the monotony of triathlon training, especially in the winter or spring, our intention is to train you for your triathlon races. But keep in mind that never will your training plan be run-focused, just because you have a running race on your schedule. If you have a running race (or a few) on your planned 2017 race schedule, we will help you select the most ideal running races for you and we will discuss how to  fit them into your training. While you may PR (often our athletes do with a smart pacing strategy), it is not our focus to help you become a better runner as we want you to become a better triathlete. 

If you are a Trimarni athlete, we will not coach you if you have a marathon on your racing schedule. First off, as discussed, we are not running coaches. Also, it takes a tremendous amount of consistency and running load to train for a marathon and this simply takes away from triathlon training. For a time-crunched, busy, goal oriented triathlete, we need all of your focus to be on how to maximize your training time and energy so that you can advance your triathlon fitness and stay consistent, healthy and injury free throughout the season, as a triathlete. More so, we need to teach you how to race smarter - not just run faster. Because our job is to develop you throughout the season, we don’t believe in dividing your year into a run season and then a triathlon season. Additionally, we don't believe that to be a better triathlete, you need to become a better runner through marathon training. We have found great success in helping triathletes become faster runners off the bike through specific workouts, designed to improve resilience, strength and endurance. From our experience, the majority of triathletes will find it detrimental to long term development to train for a marathon (even if it is “just for fun”) but more so, a marathon does not help you become a better runner off the bike. When’s the last time you saw a professional endurance triathlete race in a marathon?


4) I’m not fast, will you still coach me?

Absolutely! We believe in developing our athletes. We have experience working with all level triathletes. We are masters at helping athletes improve swim/bike/run skills, nutrition habits, lifestyle routines, racing tactics and we help athletes learn how to train consistently – all of which will help you become a faster, stronger and better all-around triathlete. Plus, fast is all relative. If you want to experience success as an endurance triathlete, you don’t need to be fast. You simply need to be great at not slowing down. 


5) I have big race goals, will you coach me? 

We are honored that you are considering Trimarni coaching to help you reach your athletic goals. Over the years, we have worked with many athletes who have progressed to new exciting levels in fitness, all through hard work, consistency and trust in their coaches. We have had athletes podium at races, achieve PRs, cross the finish line at a half or full distance triathlon for the first time and qualify for the Ironman World Championship. While we appreciate that you are putting your trust into us as your coaches, we believe that you are already on your way to achieving your big scary race goals, simply because you are willing to make the necessary investments in your daily and triathlon lifestyle. We look forward to working with you.


6) Can you explain more about the educational team? 

The educational team is our way of helping you learn about the sport of triathlon. While there is no shortage of information available to triathletes, in magazines and books, on the internet, on forums and blogs, it can be difficult to decipher the “best” information for you and your needs and how to apply what you read. As a member of our educational team, not only do you have the opportunity to ask questions to Marni and Karel, but you have an unlimited amount of education coming your way, on topics that you will find practical and season-appropriate, throughout the year.
A highlight of our educational team is the weekly “check-in” handout that you will receive in your inbox once a week. This is in addition to other videos, questions and conversations that will help you with your triathlon knowledge. Every week, you will read about a specific training, racing or nutrition topic that will be relevant to your season but also to the sport of triathlon. Perhaps it was a question you asked about how to ride your bike in the wind or how to fuel for a long run or maybe you never knew how to properly run up hills or how to taper for a long distance triathlon?  The topic choices are limitless and that is why we have found great athletic success among our educational team athletes - they are simply excited to learn and apply, learn and apply.
Also, you have access to our private team Facebook page. We understand that training can often be lonesome and sometimes your family and non-tri friends don’t always “get you”. Our private team page is an outlet where you will never be judged, there are no silly questions and the support, motivation and inspiration is never-ending.  If you ever need to laugh or smile, there’s a good chance that you can come to our Trimarni private team Facebook page and your day will suddenly get better. We see our private team page as a way for our athletes to connect and to make friendships with teammates. 


7) Do I have to be a Trimarni coaching athlete to participate in a group or private training camp? 

Anyone can attend a Trimarni group or private training camp but be sure to sign up quickly as they will sell out.  

Our private camps are the perfect option if you need personal attention. In Greenville, SC. where we hold our private camps, we can give you the perfect train-cation near the mountains as we address your specific needs to create the perfect training experience. Our roads are bike-friendly and our mountain views are incredible.
Private training is an efficient, valuable and informative solution if you have particular limiters which are preventing consistency in training or keeping you from getting to the next level with your fitness. All skill levels are welcomed. Our camps tend to be cycling specific (if desired) as we have the perfect terrain to help you improve your bike handling skills, combined with an experienced cyclist turned triathlete to give you one-on-one attention.
Our group camps offer the perfect mix of training, skill focus, education and fun and we can promise that you will leave camp with improved fitness and confidence and long-lasting memories, with new friends.  
Retul fits are provided at our group and private Greenville camps for an additional charge.