Ask any trainer and they’ll tell you — kettlebells are here to stay and they work. Here’s why: kettlebell exercises demand the use of multiple joints, which engages all the larger muscles of the body. This burns calories faster than isolation moves, which only work one muscle. “Kettlebells are also effective because they target all aspects of fitness, including strength, endurance and power,” says Mike Bell, a personal trainer at willSpace, a New York-based gym. So if you haven’t picked up a kettlebell yet, it’s time you do. Here are Bell’s five beginner-friendly exercises that are simple enough to master and will no doubt juice up your gym routine.