It’s probably hard for most of us to resist a physical challenge…that’s what Powerade seems to be banking on in their latest interactive ad campaign. Three billboards have been placed around the city of Berlin, Germany, each offering a different challenge. The one pictured above allows users to pull the bar which then lifts the billboard off of the ground. Another is a rotating rock climbing wall, while a third billboard is padded and challenges passersby to see how hard they can punch it. These are interactive in the truest sense of the word and as a result, challengers work up a thirst. Street teams are on hand to fix that, handing out samples of the sports drink. It would be great if Powerade would bring this campaign to Atlanta billboards and create a worldwide challenge of the hardest hitters?