This is a very important question which is asked often in my seminars all over India, and my straight forward answer before explaining the importance or their significant use in strength training is that both lifts are different and are not quite comparable. The Kettlebell Press of course has distinctive advantages and better usage, and is technically discussed in the article below. But let's first understand the dumbbell press which will allow me to explain better the Kettlebell press.
The Dumbbell press starts by keeping the humerus bone parallel to the ground. The main muscle targeted by the dumbbell press is the anterior deltoid, including the lateral deltoid, or the outside of your shoulder, and posterior deltoid, or the back of your shoulder & the triceps. We are primarily also talking about hypertrophy (increase of muscle cell size). Performing the shoulder press requires other muscles to help you stabilize. Your trapezius, latissimus dorsi, rhomboids, and other back muscles also offer assistance throughout the movement.
On the other hand, the Kettlebell press starts with 'the clean', meaning you rack the bell on iliac crest before it is pushed overhead. The muscles involved obviously are more as compared to dumbbell press which is a short single static movement.
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