Exercise Machine?

Pat and I are toying with the idea of making a big splurge on a piece of exercise equipment. We've thought about getting an elliptical or a treadmill, but I'm not sure I'll give the go ahead to spend so much money. You see, the problem with this idea is that I want something I can use when the kids are asleep. So not only does that raise the issue of how quiet each machine would be, but we also have the problem of where to put it.

Right now I have almost no ability to get a good workout in. While the machine would provide me a convenient workout, I'm just not sure we'll be able to resolve the two issues raised above.

Do you have a treadmill or elliptical? Where do you keep it, and is it quiet?

I'm thinking I'll wait until after the deployment is over since we have a lot to think about on this one. I'll just have to figure out another way to squeeze in some exercise once in a while.