In the Kettlebell Training benefits section, it explains how the kettlebells design, harbours a displaced centre of gravity. Thus destabilizing inertia when in motion.
This means the natural movement patterns that you would normally associate with using conventional weights in the same way, then become more distorted.
Under normal circumstances, those muscle groups don’t always function at their optimum capacity. But a sudden or abrupt deviation of an infamiliar movement pattern with a kettlebell, fires these deep stabilization muscles of the core into action to support the entire kenetic chain.
Normally during a (CLOSED) kenetic chain exercise throughout the movement.