Beginners women should use kettlebells between 5 and 15lbs. Beginner-level men should rely on kettlebells between 20 and 30lbs. Intermediate-level women can proceed to weights between 15 and 25lbs. Intermediate-level men can use weights between 30 and 40lbs. Advanced-level women can use weights between 25 and 35lbs. Men who’ve reached an advanced fitness level can use kettlebells between 50 and 55lbs.