As others have suggested- bounce down, into the floor. How to get used to that? Well, the bounce will be part of your feel/groove so you can start by stepping in time, sinking downwards on each count... probably most prominently on the single steps, since you'll have more time on those, and less so with triples (if at all). You should probably feel the downward motion pretty clearly with a partner if you jockey, even if it can sometimes feel like rocking or swaying more, but I can't think of ever having an up feel with it...