Is kettle bell a good excersise for core muscles?

[Samantha]

Hi im just asking a direct question about kettlebells only!!!!!!!!! Im an ex proffessional sprinter so i no all about trainning and diet ect and how to burn fat so i really dont need any advice on that , All except the new phase of kettle bell , Is it a good excersise to tone the core muscles ,and what does it exctly work ect , If anyone knows th ins and out of kettlebell id be much apprectiative as its a new excersise and im interested in combining with my running excersises