Justine grew up on a horse stable. At the age of 11 she started dressage and jumping competitions. With jumping she has ridden up to the Z ponies and became 3rd at the NK Indoor. From the age of 13, Justine participates in National and International dressage competitions for ponies. With Wonderboy she becomes a member of the Dutch A-team and is a reserve combination for the European championships.

She makes the switch to the horses with Lauda, Turbo Magic and Roh Magic. With a number of horses she successfully participates in International Youth Competitions, in which she is several times part of the Dutch A and B Junior team. After high school, Justine finished the Masterclass in Deurne.

In the meantime she has a lot of experience in training young horses up to and including Grand Prix. Justine also reached the PAVO Cup final several times with different horses. With Excalibur they become among other things best Gelding among the 4 year olds. At the Regional Championships she has already been Regional and Reserve Champion 12 times in classes Z and ZZ-L. Currently she competes with self-trained horses International.

Justine has completed the Masterclass Deurne, the Orun Level 4 instruction at the KNHS with high scores 8.5 achieved and is working independently in Laren. Justine trains horses, competes and can prepare them for sale. For these horses, boarding is possible at the luxury stable Magic Stables. She also gives instruction in Laren and its surroundings.