General description Kettlebells are simple yet effective home gym equipment that significantly improve core strength and stability. They are increasingly popular in CrossFit and circuit training. The Ironman 20kg Cast Iron Coated Kettlebell features a flat bottom for stability, a large comfortable handle, and a colorful coating that helps protect floors. Kettlebells can be used in a wide variety of exercises, making them ideal for home fitness workouts. They can be held in different ways to vary exercises and can even be used as a handle for uneven push-ups.