The kettlebell is an effective, bell-shaped piece of equipment that will help you build some major muscles. This equipment is your ticket to faster fitness, even for beginners. Well-suited to the heart rate-spiking benefits of HIIT, these weights develop power, endurance, muscle and strength simultaneously for heavyweight results. And since they're compact, adaptable and versatile, the kettlebell is an ideal bit of kit for the home workout warrior. The growing popularity of sports such as Cros