help with warm ups

[to_love_a_rose]

Thanks to everyone for their help with my earlier questions. I have yet another plea for help.

For those who lift exclusively at home, and anyone else with advice, how do you handle the warm up/cool down. My book (Weight Training for Dummies) says that you must warm up. I frequently roll out of bed and into pushups (okay, not quite, there's usually some form of caffeinated beverage first), but I can see how warm ups are a good thing, especially if I want to work up to more intense exercises.

However, as I work out at home and have no bike/treadmill/etc for some quick cardio to warm up, I'm not sure how/how much I can warm up. So, what does everyone do for their warm up? Any suggestions for an easy warm up that will do the job without much fuss?