Twenty-nine students from Mt Aspiring College in Wanaka sum up the spirit of the Motatapu Challenge. All 29 are volunteering before the race.
They will be doing a range of jobs, from carparking to timekeeping of other events and competitor registration. They start at 5.45am and their 47km mountain bike event begins at about 11am.
"These are highly motivated and high-achieving kids," said Duncan Miles, 34, who is the hostel manager at Mt Aspiring College.
"We expect them to do well whatever they do. They have always given their best over the years, so we are proud of our students."
The teenagers are using the Motatapu event to prepare to defend their title at the South Island Secondary Schools 12-hour Adventure Race Champs the following weekend.