Getting in on the kettlebell craze

The weights add more oomph to your workout, but you’ll have to mind some safety rules if you use them. Move over, dumbbells; kettlebells are cool again. The little weights with handles have been used by athletes around the world for centuries and gained popularity as the staples of 19th-century strongmen. Today, kettlebells have made it to the mainstream as the featured tools in exercise classes and gyms, with home versions of…