End of Spring Break

So yesterday while i was doing the animations I had a thought. With jumping animations do you need to actually make your mesh jump or is that something you do in the game engine. I would think that it's something you do in the engine or else you will mess up your hit boxes, of course I can always just be wrong and its something that I have to do in 3ds Max. Since on Tuesday I start my actual 3ds Max class I will ask my professor that.