(((B2Y))) I don't worry too much about the big cardio workout. I have teenagers and that provides plenty of cardio exercises. LOL
Right now it is way to hot in this blazing desert to do anything outside. So, my "exercise" consists of stretching in the a.m. and p.m. and making housework my workout. I do simple things like taking lunge steps, big steps, or lots of little steps when putting stuff away and things like that.
Shoes being left out are a big thing here. UGH! Instead of gathering up the girls flip flops and bringing them to their room at one time, I do them individually. (Although, when I am "On'ry" I sure as heck feel like just throwing them. LOL) Well, I just looked and there is only 1 pair in the living room so today when I clean that will only be 1 trip to their room.
I never go for distance. I go for time. When it is cooler out in the a.m. and even the evenings I will walk anywhere from 5 minutes to 30 minutes. I walk around my building now as that way if I get too fatigued I am close to home.
The Wii Fit is getting great reviews for not only the general public but health professionals. They are now using them in rehab facilities, PT, nursing homes, etc. Check it out as a possibility for you. I was saving for one but needed to use that $30 for something else - 2 years worth of saving for me.

There are a few members here who have one and love them and have been getting good results with it.
In the meantime, hang in there.