He says his participation in the sport evolved from his membership of the Turangi Pony Club. Turangi has its own branch of mounted games and Rhys's mother, Janese - who is also a keen horsewoman - says her son has been fortunate to have had a lot of encouragement and some great mentors. They have included Morgan Larsen-Church and Mauhana Babbington who have both represented New Zealand in mounted games events.
Janese says competitive riding is not a cheap sport.
"There's a lot of looking after that is needed to do it properly."
Rhys has two ponies and most weekends in the summer are spent travelling to horse shows around the North Island where Rhys competes in showjumping and mounted games competitions.
The ponies are currently turned out, and Rhys is keeping fit playing rugby for the Taupo-nui-a-Tia second XV rugby team. He is also looking at ways of raising funds to get to the world championships. Janese, who works in Taupo for Ag Industrial, says a supportive employer has enabled her to take time off to accompany her son to various horse events, and she is planning to travel with the U17 team to the United States in November.
"We're determined to get there, one way or another," she says.