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About Us

Aleš Suhadolnik

Master of Kinesiology
I am Aleš Suhadolnik, an endurance sports coach, Master of Kinesiology, and long-time long-distance triathlon competitor.

For over 14 years, I have been working professionally in the field of endurance training, combining modern scientific insights, practical experience, and an individualized approach to athletic performance development.

Over the years, my passion for endurance sports developed into an in-depth exploration of the physiology of prolonged exertion.

I obtained my Master's degree in kinesiology, focusing on "central and peripheral fatigue during ultra-endurance cycling," which today serves as a vital foundation for my approach to training, recovery, and performance optimization for endurance athletes.

As a coach, I have contributed to numerous top-tier achievements in triathlon, ultra-cycling, and para-cycling.

Under my guidance, cyclist Stanislav Verstovšek set a world record by covering 916 kilometers in 24 hours, earning an entry into the Guinness World Records. He later became the 24-Hour Time Trial World Champion in the USA and a three-time 24-Hour Cycling European Champion.

Triathlete Jaroslav Kovačič won a bronze medal at the 2019 Elite Long Distance Triathlon World Championship in Pontevedra, while Croatian triathlete Željka Šaban Miličić set the Croatian national Ironman distance record in the same year.

As the coach of the Slovenian national para-cycling team, I contributed to the success of Anej Doplihar, who won medals in World Cup races, achieved 3rd place overall in the World Cup standings, and became the H3 European Champion in 2026.

Currently, I serve as the head coach and selector for the Slovenian national para-cycling team, an associate at the Faculty of Health Sciences, and a lecturer at the Olympic Committee of Slovenia, where I help educate future sports specialists in endurance training.

I am also an active endurance athlete and long-distance triathlon competitor myself. I have successfully completed 17 Ironman triathlons, including three World Championships in Hawaii. In 2018, I finished 6th in my age group at the Ironman World Championship with a time of 9 hours and 26 seconds.

In addition to Ironman races, I have competed in numerous Half-Ironmans, marathons, half-marathons, and trail races, giving me a deep understanding of the physiological and psychological demands of long-term training and balancing sport with daily life.

My philosophy is rooted in continuously tracking scientific advancements in endurance and applying them meaningfully in practice.

In my athletes' training processes, I incorporate individualized periodization of training and nutrition, focusing on metabolic efficiency, carbohydrate periodization, and energy optimization during prolonged exertion.

I believe that a properly structured training program is essential not only for peak athletic performance, but also for long-term health, superior recovery, and sustainable athletic progress.

Marjetka Šibelja

Bachelor of Science in Dietetics
I am Marjetka Šibelja, a dietitian with a Bachelor of Science degree, a licensed personal trainer, and an active triathlete (having successfully completed 6 Half-Ironmans and 3 Full 140.6 Ironmans), combining professional nutritional expertise with long-standing endurance sports experience.

In my work, I believe that a balanced diet and a healthy lifestyle are key to improved well-being, athletic performance, and long-term health. Through my holistic approach, I help individuals understand nutrition in a practical, realistic, and sustainable way.

I am particularly focused on sports nutrition, supporting an active lifestyle, and providing individually tailored nutritional strategies.

As an active triathlete, I view nutrition as the fourth discipline of triathlon, which must be approached with the same level of seriousness as training itself, and should therefore be understood and treated as a key pillar supporting the training process.

I have a deep understanding of macronutrient periodization aligned with training concepts, as well as the real-world challenges of balancing training, recovery, family life, and daily commitments. As a result, I always seek solutions that are realistic, effective, and sustainable over the long term.

With extensive experience in sports nutrition for endurance athletes, I serve as a nutritional consultant in the Aleš Suhadolnik The Coach team, successfully guiding athletes toward proper sports nutrition, structuring macronutrient periodization within their training framework when needed, and creating tailored pre-race and race glycogen-loading strategies for each athlete.

Combining my nutritional background with first-hand experience in long-distance triathlon, I seamlessly translate theory into practice to offer every individual maximum nutritional support.

Client Reviews

"I came for personal nutritional counseling and training sessions wanting to do something for myself, but I received far more than I expected.

What I liked most about Marjetka was that right from the start, she quickly understood where my challenges lay and what I needed. I never felt like she was following a cookie-cutter program; instead, everything was tailored specifically to me.

Both the nutritional guidance and workouts were constantly aligned with my goals, and she tracked my progress meticulously, adjusting the plan along the way."

Alenka G.Š.

"Aleš created running workouts for me that were truly tailored to my needs. The training was thoughtfully structured—from the very first steps to a gradual and steady increase in pace.

I never felt like it was too much or too little, but just right for me to make progress while staying motivated.

What I appreciate most is their personal approach. I always felt that they genuinely cared about my progress and well-being."

Alenka G.Š.

"I decided to get nutritional counseling from Marjetka because I really wanted to lose weight. I got so much more than just losing 15 kg. I learned how to eat normally, adjust my portions, move more, and for the first time in a long time, I feel like I can actually maintain this lifestyle.

Marjetka is truly a great choice for long-term changes rather than quick diets. Everything is individually designed, and you really feel like you have 100% support."

Mojca M.

"I am extremely satisfied with my coach. The workouts are professionally planned, tailored to my goals, and always well explained. With his help, I have significantly improved in both strength and endurance.

In addition to his great expertise, he is always accessible for questions, motivates me, and knows how to adjust the plan when necessary. I highly recommend him to anyone looking to make serious progress in cycling as well as triathlon."

Blaž G.

"If you are looking for a top-tier coach, Aleš is the right person. The biggest trap in ultra-sports is the mindset that 'more is always better,' which caused me to stagnate for years when I trained alone based on my own feel.

Working with Aleš was a complete game-changer. Together, we targeted our preparation for the Ultra 24h, and his training system led me to the European Championship title in the W 50+ category in just one year.

Aleš doesn't just write workouts; he brings out the absolute best in an athlete in a sustainable way without causing overtraining. I have never been faster or better prepared! We are naturally continuing our collaboration—onward to new goals and victories!"

Ksenija O.

"I never imagined I would one day become an Ironman, but with Aleš, that goal was much easier to reach. The entire time, I felt like I had a coach by my side who knew what he was doing and who believed in me even when I didn't. Thank you for an unforgettable experience!"

Nikola S.

"In less than a year with Aleš, I can feel huge progress in all segments of training. The goals we set for this year are being achieved very quickly."

Živko S.

"As an athlete, it is very important to me to get an answer to every question from my coach. Aleš regularly follows the latest developments in the sports world and gathers knowledge, which he puts to good use in practice. My results are proof of this."

Anej D.

Are you ready for optimal training and nutrition?

Get in touch with us and let's talk about your goals and desires.

Aleš Suhadolnik