If you are trying to lose weight, check out these two websites. They will blow your mind and inspire the hell out of you!
Number 1 - Revolutionize the body weight calculator, this is the SIMULATOR! Play with it. It is so detailed. It tell you EXACTLY how much work to do and calories to eat to reach your goal weight in so many days. I can't even explain it, just look at it.
http://bwsimulator.niddk.nih.gov/ Number 2 - A daily workout plan with rotating workouts for the month of December. She creates a new plan every month. This is the best challenge ever!
http://www.myfitstation.com/