Hi Sweet ... Is there any particular reason you can't go running or brisk walking outside? I just came back from an run and it's -10C/14F and it was AWESOME ... When I run outside in the winter, I personally feel, that I get a better more refreshing, envigorating workout... And surprisingly you don't have to dress that warmly because you will get quite hot while running...Have you ever tried it? Try it you may just like it more than you think

... Let us know of the results if you do try it ...