Last Adventurer October 21, 2013 IIAWT, Hiking Denali 2014 Training - the Infamous 'Backpack of Pain' Last Adventurer October 21, 2013 IIAWT, Hiking The Last Adventurer continues his series of training videos about Denali and follows up on a theme of In Ice Axe We Trust - building core strength with a piece of equipment known as the "Backpack of Pain"; an extremely loaded backpack.