-- It might not look much but these cannonball-like exercise implements are much more effective than any other complicated machines around today. Kettlebells have a lot of benefits to offer you in terms of fitness. Experts in Sports Medicine and Fitness all agree that kettlebells work your muscles and joints in a more harmonious way than other fitness machines. Although this metal ball is used by bodybuilders, even regular people can reap the benefits of a good kettlebell workout. Many have, in fact, shared stories about how they were able to lose weight and tone their muscles successfully with just a few minutes with their kettlebells every day. Core Strengthening. Because the kettlebells ...