AbdulAlhazred
Legend
Tree Top Runner / Brachiation - Acrobatics
This allows you to when in the forest or similar areas of protruding landscape (difficult terrain) to be unaffected by the difficult terrain while using Long Distance Runner practice (perhaps at level 16 you also gain a climb speed equal to your speed)
Design note : In the manner of other recent practices this changes the nature of another practices while giving it some extra pop...
Right, though I might even go to the further end of this and make up ANOTHER practice which gave you the final climb speed part. Heck, why not? The beauty of it is that there's no finite set of slots here that you have to work with. A practice can be EXTREMELY niche. Heck, it can be tailored to one specific situation that will come up one time in a game and never again, its still useful. In that later case I might recompense the character for the expense, as I'd consider it a plot element vs being a character building element, but now that I'm using abstract wealth in HoML even that consideration is gone (well, unless the expense is extreme).