I'm sure you've seen these innocent looking things by the window of fitness shops and thought, "OK, like THAT'S gonna help me with burning fat and stuff". Well, all I can say is, you will be surprised!
The thing about the kettle bell is that it's perfect for you "so-busy-that-I-can't-find-time-to-exercise" lot out there. It's not expensive and you can easily keep them at home or at the office and use them whenever you want.
Seriously though, having known only dumbbells and barbells all this while, using the kettle bell was a nice (and intense) surprise. I regularly use it for squats now, and I can feel the results. For more ideas on how to use the kettle bell, check out this video: