Sione Jongstra   Siosport

Coaching people as a result from the passion for the sport. Getting the best results out of every one and trying to keep the athletes from making "mistakes" that keeps them on the side line. Coaching male and female athletes, mainly triathletes but also runners.

References available on the website:


Name: Sione Jongstra
Gender: Female
Coach since 2002 (officially via Siosport 2013)

A few coaching results:
Joost van Borrendam (37) in 2,5 years to a sub 3 hours marathon.
Ilona Heerdt and Ellen de Ruiter accomplishing their first half Ironman at the age of 50. Now wanting more to finish an Ironman.
Coaching Ruben Veld to become an Ironman besides a full time Finance Manager job and a family.
Sander Hoogeveen (25), previous swimmer who improves a lot. We take the time as the running needs some time to built up. But went last year from a 20 min to a 18:30 5K. Up to the next minute to be able to compete for the podium in the First Division of the Team Competition.

My own palmares
17th Pro Ironman Hawaii
2x 3rd Place World Champs Long Distance Triathlon
1x 3rd Place European Champs Long Distance Triathlon
10 x National Champion (triathlon/duathlon)
4 top 10 Places Ironmans
4 x National Champions Premier League Teamtriathlon



Preferred Athlete Levels

Beginner, Intermediate, Advanced


1-on-1 Coaching, Consultations, Group Coaching, Training Camps

Sport Types

Triathlon, Road Cycling, Running


English, German, Dutch