Kettlebells are cast iron weights ranging from 5 lbs to over 100 lbs, shaped like a ball with a handle for easy gripping.

Kettlebells offer a different kind of training using dynamic moves targeting almost every aspect of fitness—endurance, strength, balance, agility and cardio endurance. People love it because it's challenging, efficient and you only need one piece of equipment.

Some movements have you changing the weight from hand to hand as the weight swings up or as you move laterally, requiring you to stabilize the body and engage the core in a whole new way.

Other moves require power from the legs and hips to move the weight, giving you integrated whole-body movements that are often missing with other types of training.