buying an elliptical

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If you just want to lose weight, I would recommend trying out Dance Dance Revolution at home. In my opinion, it is one of the most intense cardio one can do at the higher levels, and the fact that it is a game makes you play it more. I would say that playing for an hour can probably burn a thousand calories at higher levels.

If you have a playstation or x-box, check it out. If you don't have a games system, you can download DWI or Stepmania (google them), and you can play from your computer.

The fact that you are having fun exercising means you will keep playing, unlike an exercise machine which you would have to be extremely disciplined to keep up.