Experience with Kettlebells?

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Okay so I'm looking to order some kettle bells. I've heard there good for weightless & toning up since they combine both cardio and strength workouts. I've read a few reviews but you never know whether people are paid to say that stuff on certain sites or not. I know you guys will be completely honest and unbiased, so should I take the plunge and order some? What's your experience with kettlebells and have you seen a difference?

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