These endurance horses were bred by Matthew Sample, a winner of Australia's ultimate trophy for Endurance Horse Riding, The Quilty Cup. Most of his horses are full or part Arabian breed. Sample's breeding farm is 80 acres of Derrier Pocket in the Yabba Valley a few kilometres west of Imbil, and adjacent to Imbil State Forest.
The annual Quilty Cup Endurance Ride is held over a 130 Km (100 mile) course. The first national endurance ride was held at Richmond NSW. Other venues have included Wilberforce, Colo, Watagan, Canowindra, Tooraweenah and Manilla in NSW; Gawler, Port Elliot and Mt Pleasant in South Australia; Mundijong, Mornington Hills, Toodyay and Collie in Western Australia; St Helens and Sheffield in Tasmania, Myrtleford, Landsborough and Tonimbuk in Victoria and Kenilworth, Boonah, Nanago and Kilkivan in Queensland.
Mary Valley Adventure Trails provides other opportunities for people to enjoy horse riding, at a leisurely pace, in the wonderful forests of the valley.