On Tuesday 29th December,  four ultrarunners (including Dr David McKinnon) will be attempting to complete the Australian Alpine Walking Track.
The track is 670km long with over 28,000m of ascent and descent through some of Australia's harshest terrain.  About 20 people hike the track each year with most taking 40-50 days using several 'food drops'.
Whilst records are not officially kept (as it may encourage inexperienced and inadequately prepared people) the quickest confirmed traverse is 22 days, a time the team hopes to beat.

Follow their blog at  http://www.alpineultra.blogspot.com/