About Us

Since 2012, GlobalLimits had been organizing multi-stage races in Cambodia, Bhutan, Sri Lanka, and Albania. São Tomé is organized in 2020 especially for qualified runners.  Our goal is to combine running with local cultural appreciation – that is, all our race locations have spectacular historical backdrops and there are always opportunities to stay in local homes.   

Our team, including our volunteers and local partners, are experienced runners or event organizers; we have proven track records in organizing successful multi-stage races.

Our professional medical team specializing in wilderness and emergency medicine will provide you necessary high-standard medical treatments during the race week.



Stefan Betzelt/Germany - Founder and General Manager of GlobalLimits

Stefan was born and lives in Wiesbaden/Germany. He founded GlobalLimits in 2012. Stefan has a wealth of extreme racing experience, having participated in many of the most gruelling ultra races, such as Marathon des Sables, Les Foulees de la Soie, Himalayan 100Mile Stage Race, Racing the Planet Namibia and Desert Oman Raid. He also participated in about 20 city-marathons (PB 2:46) and successsfully climbed the Kilimanjaro and the Mount Aconcagua.

Stefan has visited more than 85 countries and learnt a great deal about different cultures and people. He now makes use of this experience to select outstanding and unique locations for the GlobalLimits races.

Stefan has worked as a managing director for some of the leading global financial institutions before he retired in 2004 to become a self employed financial and personnel consultant.

Stefan is also a member of the Curatoship of the Institute of Sports Medicine in Frankfurt/Germany.

Mario Machado, Lisbon/Portugal - Course Director

Mario, a physical Education teacher and international athletic coach, is the technical director of the Lisbon Half Marathon (30.000+ runners), the Portugal Half Marathon, the Lisbon Marathon and the organizer, technical director and controller of the race of various other high profile road races in Portugal and international trail races.

Since 2009 he is also the "Controller of the race" of the Marathon des Sables in Morrocco.

Mario is the publisher and director of "Spiridon-Portugal" running magazin since 1978.

He is also a very experienced runner himself. He just finished his 100th Marathon/Ultra at GlobalLimits Cambodia 2017.

Mario already served as a volunteer for the inaugural race in Albania in 2017 and in Cambodia 2018 as well as being the course director in Albania 2018 and 2019.

Ryan Paterson, Denver/USA - Medical Director

Dr. Ryan Paterson attended the University of Vermont School of Medicine and completed his Emergency Medicine Residency and Fellowship in Wilderness/Altitude/Expedition Medicine at Denver Health Medical Center/University of Colorado. He also holds advanced certifications in Tropical Medicine from the London School of Tropical Medicine and Hygiene (DTM&H) and in Mountain Medicine (DiMM). He is a practicing Emergency Physician for Kaiser Permanente at St Joseph’s Hospital in Denver, Colorado.

Dr. Paterson serves as co-course director for the Wilderness Medical Society and Universities of Colorado and Utah’s Diploma in Mountain Medicine Course (DiMM). He is the current United States delegate to the International Society of Mountain Medicine (ISMM). Currently, Dr. Paterson is working, in partnership with CU South Denver to develop a Wilderness Medicine for Kids program utilizing an original curriculum. He also serves as medical director for No Barriers and another non-profit (Kolkata City Mission) working to establish sustainable development solutions in education, health, women’s empowerment, micro-enterprise and public-health for informal communities in and around Kolkata, India.

Ryan already was our medical director in Cambodia 2016, Bhutan 2017, 2018, 2019 and Albania 2018.

Jennifer Starling/USA - Race Doctor

Dr. Jennifer Starling practices Emergency Medicine for Kaiser Permanente at Saint Joseph Hospital in Denver, Colorado, and is an Adjoint Assistant Professor at the University of Colorado School of Medicine where she teaches wilderness, altitude and travel medicine.  She has a tropical medicine degree from the London School of Hygiene and Tropical Medicine, and a Diploma in Mountain Medicine.  

As a Himalayan Rescue Association volunteer, Jen provided medical care to Everest Base Camp trekkers and local Nepali at a high altitude remote clinic for a trekking season.  

She has worked as race medical for two multi-stage ultramarathons in the American Southwest, and GlobalLimits Cambodia 2015, Bhutan 2016 and Albania 2019. 

Rhonwen Mansfield Thomas/Great Britain - Race Doctor

Rhonwen is a Paramedic from the UK. She has been working for the Ambulance service in Kent for five years and has recently completed a post graduate diploma from St Georges University to qualify as a Paramedic Practitioner. She has volunteered at twice at the Jungle marathon in Brazil and for GlobalLimits in Albania, 2017.

While she is not a runner she loves the outdoors. When she is not at work she is often hiking in the welsh mountains, surfing in Devon or riding a mountain bike down a trail.

Rodrigo Acinas, Spain - Course Marker

Rodrigo was born in Burgos, Spain and is working as a financial controller for companies. 

He is passionate about trail running and road cycling.  Mountains and nature are his favorite playgrounds.

Despite not enjoying competitions as much as he do when training without a goal, he still enroll in demanding mountain races.  The competitive streak needs to be fed!

He always loved the air one breathes in GlobalLimits’ races - He had volunteered in Sri Lanka 2016, Bhutan 2017 and Albania 2019 – apart from the physical challenge you meet up with old and new friends. 

"I will try to make everyone feel at east during the race and I will be pleased with my contributions as long as I am helpful to you – to achieve your goal, whatever it is." 

Harri Washington, Great Britain - Volunteer

Harri is originally from the UK and has lived and worked in Madagascar, Gabon, and Cambodia.

Working in wildlife conservation means that she has had the privilege to see some beautiful parts of the world, which she explores through another passion, running. She has been living in Cambodia for ten months now, where she enjoys running cross-country out in the remote province of Mondulkiri, as well as joining group runs in Phnom Penh and the surrounding area. She enters organised races in every place she lives.Harri just finished 3rd female in her first multi-day stage race at GlobalLimits Albania 2018.

She is looking forward to being inspired to take her running to the next level by experiencing firsthand the challenges and rewards of a GlobalLimits race.

Harri already served as a volunteer at GlobalLimits Cambodia 2016, 2017, 2018, 2019, Bhutan 2017 and the inaugural race in Albania.

Neus Collado, Blanes/Spain - Volunteer

Neus is Spanish. She has traveled to more than 70 countries, and has participated as a volunteer in several ultra trails and stage races around the world, as she accompanies her husband runner in all the adventures that are proposed.
She has been in the Amazon of Brazil, in the Peruvian jungle, in the Himalayan mountain range, in the Arctic, among many others. He also organized the Costa Brava Xtrem Running for 5 years, a stage race involving up to 400 runners every year from more than 45 diferent nationalities.

Chemistry by profession, passionate about paddle surf and an amateur athlete, always ready to help and enjoy the adventure of ultra trails. After her experience as a volunteer in this type of racing, she admires the spirit of overcoming of the runners.

Neus already served as a volunteer at GlobalLimits Cambodia 2017, Albania 2018 and Bhutan 2019.

Marco Cych, Bad Kreuznach/Germany - Volunteer   

Marco was born and lives in Bad Kreuznach/Germany.
After having been a gymnast in his youth he discovered running.
He participated in more than 60 marathon and ultra distance races so far.
Working for an IT company running means the needed work-life-balance for him.
Travelling is his second major passion and he visited countries on six continents.
He is always ready to face a new challenge. This is exactly what he is doing by volunteering at GlobalLimits races.

Marco already served as a volunteer in Bhutan 2014.

Amy Sparks, New Zealand - Volunteer

Originally from the UK, Amy moved to NZ 10 years ago and has never looked back.  Having volunteered across the world for mutlistage ultra marathons she loves travelling, meeting new people and seeing them achieve amazing things.  After seven events she has finally transitioned from volunteer to competitor at the A20 race in NZ, Feb 2019.

When she's not travelling the world, Amy is the Marketing Manager at a print, website and signage company she owns with her husband, or can be found Olympic Lifting at the gym.

Amy served as a volunteer in Cambodia 2018, ran in Albania 2019 and in Cambodia 2019.

Adri Kasmi, Tirana/Albania - Volunteer

Adri was born in Tirana, Albania. He has finished Bachelor at Sports University of Tirana, Faculty of Movement Sciences and Master of Science at Faculty of Physical Activity and Recreation in field of Physical Activity and Health. After successfully completed his studies, started part time job at Sports University of Tirana as an assistant professor for Outdoor Activities and Winter Sports. Currently he is a tour guide for outdoor activities at Tour Operator Albania Adventure. He also works at Albanian National Olympic Committee, especially in Development Program by Olympic Solidarity for Qualification of Coaches.

He is passionated in hiking, 4WD Off Road driving, mountain biking, ski touring, Kayaking, Stand Up Paddling. In Scuba Diving he has a license as Dive master.

Adri has been the driver of the Course Marking Team at GlobalLimits Albania – The Hidden Treasure for the last 3 years.

Hana Heimerdinger, Germany - Volunteer

Hana, 18 years old, was born and raised in Berlin/Germany. She lived in Rome for 2 years and finished high school in summer 2019. Next to her passion for dance, photography, nature and travel, she describes herself as open, adaptable curious and adventurous.

Currently Hana is spending her gap year in São Tomé e Príncipe, the islands of her dreams, where she volunteers for a nature conservation project. In the future she wants to study textile design

Tiziano Pisoni/Mucumbli Explore, São Tomé - Logistics & Infrastructure