"The kids did the same as the adult course held on Sunday and everyone who started the course finished it- it was amazing."
Mr Fleming said it was also great for the childrens' self esteem and confidence.
"They were put right outside their comfort zone but loved it and they all had a great experience."
The Years 3 and 4's completed a 1.5km course while the Years 5-8's completed a 3km course.
Mr Fleming said the junior event would definitely be back again next year after a good response and feedback from participants.
"We were thrilled with the turnout and enthusiasm by the kids, it was definitely a success."
Sunday's challenge saw 600 participants complete the race in what Mr Fleming described as the muddiest and dirtiest course they had seen out at Clifton Station.
The event is held in six locations around the country every year and has been in Hawke's Bay for the past four years.
The national event started 15 years ago with one location and 400 competitors and now has about 25,000 participants throughout the country.