The most recent edition of this event was on 3 April 2016.
The Galston Gut Buster at Hornsby Park has a 21km half marathon and 8km trail running events.
This trail run goes through the stunning Berowra Valley National Park on the edge of Hornsby. It takes in part of the Great North Walk and encompasses the best the park has to offer, including: river crossings; fast fire trail; and stunning single track along the Benowie walking track.
Prizes will be awarded for podium places for men, women and juniors in the half marathon and for 1st place in the 8km.