Because they are incredibly effective at producing real results. Kettlebells can be used to perform traditional exercises or special kettlebell exercises. They can be used for a power cardio or a strength workout. They build lean muscle and strip off fat and can be used for either low grinding strength reps or high rep swings. Kettlebells develop endurance, flexibility and functional strength that can be used on the field or in your sport, not just in the gym ... they are the ultimate all in one gym.
The unique design of kettlebells with the centre of mass displaced from the handle makes exercises both harder, yet easier to perform. High rep swings leave you puffing like you have done multiple 400 metre sprints, but the design means you haven't wiped your knees out in the process. The most basic kettlebell exercise is the swing. Swings develops an explosive hip snap, fantastic for tackling in rugby, doing deadlifts for powerlifting or for targeting those troublesome glutes and hamstrings. As numerous kettlebell exercises are done one handed they promote co-ordination and develops the core and other stabiliser muscles. These stabiliser muscles are constantly being worked, resulting in abs of steel with explosive power to match.
Kettlebells have traditional been used by weightlifters because the Olympic lifts ie, the snatch and the clean and jerk, can be learnt quickly once kettlebells are mastered. You can now get all the benefits of the Olympic lifts without having to master all the finer technical points of Olympic lifting. Using kettlebells for snatches and clean & jerks can develop explosive power in your hips, a strong injury resistance back, greater flexibility and this transfers over to any sport where tackling, sprinting or jumping is required.
For those after aesthetics as well as performance, high rep kettlebell drills are also excellent at burning fat. There is a growing trend towards power cardio workouts and away from low intensity aerobics ... and for this kettlebells are excellent. You will look lean, strong and athletic with performance to match.
Finally kettlebell workouts are fast and effective and best of all can be done in your own time in your own space, eliminating the need for a gym membership or expensive equipment

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