If you think kettlebells are just glorified dumbbells, keep reading. “A kettlebell’s center of gravity actually shifts during the course of the exercise,” says Jason C. Brown, C.S.C.S., owner of Kettlebell Athletics, in Philadelphia. In that way, it’s like many of the objects you lift everyday — briefcase, milk gallon, unruly toddler — and repeated use provides much the same benefit: Functional, real world strength.
“Its unique shape also allows you to transition from one move to the next without putting it down,” says Brown. Trainers call that “kettlebell flow,” and the results speak for themselves: A greater fat-blasting, metabolism-boosting workout in less time than ever before — with just one weight. And for more than 70 genius workouts like this, check out The Men’s Health Big Book of 15-Minute Workouts and The Women’s Health Big Book of 15-Minute Workouts.