Well, he's a two-handed fighter/barbarian, so outdoorsman/lumberjack to get him familiar with using large chopping weapons to cut down large trees in as few swings as possible? A bit of a stretch by real world standards, but I don't think that would be so much the case in an anime universe. The basic principle is the same, though instead of chopping down large trees, it's much softer objects that are more prone to movement.
