The annual 100 mile (160 kilometres) extreme marathon at Tarawera will just be finishing as Sunday Morning goes to air. The runners set off on the grueling route which runs from Kawerau to Rotorua through forests, around lakes and past some stunning scenery. The event is New Zealand's most prestigious ultramarathon and part of the Ultra-Trail World Tour. A total of 2500 participants have registered for the event. Sunday Morning will speak to one of the runners who've completed the run after starting at 4am on Saturday.