When I was a kid I collected pop bottles alongside the road, because back in the day you could turn them in at your local grocers and they'd give you a dime a piece for them. The grocer in turn would return them to the bottlers, who'd clean them, sterilize them, and then refill them with fresh pop.
For we Christians, it's the same with our bodies. When we die, our spirits immediately go to be with Jesus in heaven ("to be absent from the body is to be present with the Lord"; no gap of time indicated at all), while our poor old bodies, just like those empty pop bottles, "lie a-moulderin' in the grave," as the old song puts it.
But someday God will resurrect those bodies, instantly making them clean and new and just like Jesus' own body--strong, healthy, able to travel the heavens at the speed of thought, glorified, if you will--and we'll take up residence in them once again. Pretty sweet!