Most of the world sees calisthenics as exercise based around using your own bodyweight to build muscle.
BuzzFeed spoke to the director of the documentary Graceful Girls, Olivia Peniston-Bird, about the sport, and the incredible stories behind it.
"For those involved, a tight-knit community which in many cases spans several generations of Australian women, they live for it."
Diane's return to coaching coincided perfectly with 23-year-old Brianna Lee's final attempt at winning the competition's highest honour; The Most Graceful Girl.
Australian calisthenics has been around since 1927, and according to Peniston-Bird, Diane is widely regarded as having "transformed it in the '70s. She won't put up with anything less than 200% from the kids and parents".