Do you have a Wii Fit or even one of those step-stool exercise things you can go up and down on to replicate stair climbing? Might be easier to exercise in the home than having to go outside if you aren't feeling well, depending on the weather in your area on any given day.

There are probably exercise calculators online that do calorie comparisons between exercises ... you aren't worried about the calories, of course, but if they say five minutes of jogging equals ten minutes of stairs, or something like that, at least it would give you some ideas to work with.