What is an at-home exercise program that doesn't require weights?

What are some exercises that I can do assuming I have nought but a floor and myself.What is an at-home exercise program that doesn't require weights?
Go here:
http://crossfit.com/
Do some reading. There are intense programs for whatever your hope is, using nothing but your body substance and imagination.
Or, buy or rent any of the "military fitness" videos. They use no weights, and are within great shape, which is the point of the folks at the website above.
If you're wanting to lose weight, you want to do something like step or run in place to attain your heart rate up and burn calories.
If you just want to tone up, do push-ups, sit-ups, squats, lunges...you find the idea.

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