Kettlebells for Beginners

The kettlebell is a rising star in the fitness world, many tout them as replacement to the dumbbell, a one-size fits all, whole body conditioning work out contained in a neat iron package with a handy handle. They have gained popularity and it seems every 2nd personal trainer out in parks has their clients training with kettlebells.
Is this humble piece of metal really that good? Simply put, yes they are, with their displaced centre of mass, smooth handle designed to rotate easily around the hand and mixture of ballistic and grinding exercises they force you to activate more muscles in your body (whether you want to or not) and give a superior workout.