Training function matters with kettlebells because the tool can serve several different jobs: strength work, hinge power, conditioning, carries, mobility support, and skill practice. A kettlebell program is useful only when the exercises, load, reps, and rest match the job it is supposed to do.
Without a clear training function, kettlebells can become random hard work. The best use connects the bell's offset load to a specific outcome, such as stronger hinges, better carries, more controlled pressing, or a compact conditioning session.