A vat of kettle bells

The growing popularity of kettle bells, the primitive-looking bowling-balls-with-handles that deliver a great all-body workout, has given rise to similar products with more flexibility. Available now are weight-changeable kettle bells that can be customized to new fitness levels, for different family members or even during a workout — so you don't have to own more than one. Below, find four innovative ways to throw your weight around. — Roy M. Wallack

Roy Wallack

April 26, 2010