Hi, and welcome to SparkPeople. I exercise all the time, and have never owned a gym membership. If it's too cold to exercise outdoors, you can pop in a DVD and workout with your television. The local library should have some to try, so you don't even have to spend money.
The video section here at SparkPeople is AWESOME!!! I love the Coach Nicole videos. If you look near the top of your page, you should see a line with headings on it, starting with "my SPARKPEOPLE". To the right of that, click on "ARTICLES & VIDEOS", and you should be able to see the video link there.
Here is a great article to get you started: http://www.sparkpeople.com/resource/fitn ess_articles.asp?id=584
Good luck reaching your goals. Please let me know if I can help further. Judi 1186 days ago