What is the deal with kettle bells? I always thought that they were just weights with handles. Are the movements or "lifts" different?
Because the weight pivots in your hand, it's easier to do more dynamic exercises (swings) that work more muscle groups simultaneously and provide interval cardio training at the same time. It can burn up to 20 calories a minute if you push it - the same as a 6 minute mile.
At least that's what she's selling in the first book.