A kettlebell is a smooth cast iron ball that can weigh anywhere from 5 to 175 pounds. (fitnesshealthzone.com)
Present theory holds that there is a Pluto - size solid iron ball at Earth's center surrounded by an extensive zone of liquid iron. (discovermagazine.com)
What Oldfield does is wind up his 6» 5» and 280 pounds into a torque of lightning and whirl into the spinning arc of a discus thrower through a full turn and a half (540 degrees) before releasing the 16 - pound iron ball and watching it float out there into history. (si.com)