Here is a video of me doing a kettlebell circuit. It is edited due to the length but gives a good idea of how to structure a circuit training session with a kettlebell
Give this fat burning circuit a try in place of your long, boring cardio!
Squats x 20
Pushups x 12
Mountain Climber x 10 each leg
Alternating Forward lunges x 10 each leg
Medicine Ball Rotation x 20
Repeat 3-5 sets, resting for one minute in between!