Kettlebells give you the opportunity to move athletically with additional resistance from a variety of angles and more challenging positions, and planes of resistance.
Exercises such as kettlebell swings, can help increase your heart rate, adding as cardio and can tone muscle, but where they really come into their own is in building strength throughout your posterior chain.
Kettlebells are an incredibly useful tool for those looking to build their base of strength and mobility.
The best being the Kettlebell swing.
Initiated by a powerful hip thrust from your hamstring and glutes, opting for heavier weights (once the move is mastered, of course) for up to 90 seconds a set will vastly improve your anaerobic fitness, accelerating your heart-rate and ignite a fat-burn that the bench press can only dream of.
This movement is a full-body workout and is extremely effective, getting a cardio burn in. Thrusters target your quads, calves, and glutes in your lower body. Then, in your upper body, it works the pecs, delts, biceps, and traps.