As you know, kettlebell training has been around for years. It is an excellent way to train muscles that are hard to target with just dumbbells or weight training. Another added benefit of kettlebell training is that it can become a cardiovascular training very easily. When you are moving from exercise to exercise, your heart rate will definitely increase. So a few kettlebell exercises which can be good for strength training and muscle toning, can now insight cardiovascular endurance as well. This is very similar to a circuit training you would use with the apparatus at the gym.
Please give kettlebell training a try. It sure helps the boredom factor when training. It just might be that little nudge you need to blast that plateau in your present routine.