The walking is all done in your home. You don't need much space at all (I live in an apartment.), but it is still a good work out. It is more fun than regular walking in my opinion. You are also using other moves besides just walking.

Many workout tapes end up sitting around after I have used them a couple of times. I've really used my walking tapes though. I think you can also buy audio cds you can listen to when you are walking outside, but I haven't tried those yet.