The 14-year-olds were among 140 athletes chosen to take part in the four-day coaching camp that aimed to develop and support young athletes who had shown commitment to the sport.
Mathews, a Shenton College student, said the camp involved a big theory element.
Hardisty said they could use the advice they received to prepare for future events, such as the WA All Schools Track and Field Championships at the WA Athletics Stadium at the end of the month.
The pair are also training for a meet between Singapore, Malaysia and WA next year.
Mathews competes in discus, shot-put and high jump, and Hardisty the 200m, 100m and 400m hurdles.