Kettlebell training has been around for a long, long time. It combines strength training, endurance, cardio all in some simple straight forward workouts. I worked out with a personal trainer at a gym for a solid year. At the end of that year, the gym that the trainer worked for wanted to cut the amount of money that they were paying the trainers, and also charge more for their customers (me). My trainer was fed up with their policies so he, and several other trainers abandoned ship. He offered to train me for a discounted rate and we started working out in a park with kettle bells. I can tell you I saw a significant improvement in only a couple of months. It was exponentially greater than any progress I made while working out with regular dumb bells and fitness equipment at the gym.
Kettle bell training is, by far, the best workout I have ever done. My strength increased dramatically!
F, if you are interested in trying it out, I highly recommend you check out Ketteworx DVD's. A big, big warning. This is not your average workout. Do not think that you need a big weight. I would not start with anything larger than a 16 lb kettle bell. You can always up the weight down the road, but I promise you this: the 16lb weight and the Kettleworx DVD Workout will definitely kick your a$$!!!