From 2708 of Catechism: Meditation engages thought, imagination, emotion, and desire. This mobilization of faculties is necessary in order to deepen our convictions of faith, prompt the conversion of our heart, and strengthen our will to follow Christ. Christian prayer tries above all to meditate on the mysteries of Christ, as in lectio divina or the rosary. This form of prayerful reflection is of great value,

As a form of meditation the rosary engages the body using the ancient technique of a string of beads. From Praying the Rosary by Megan McKenna :

Originally all forms of beads—ropes with knots, cords tightly twisted around one’s fingers or wrist or kept hidden in a pocket or under a surplice or apron—served as a reminder to follow the exhortation to pray constantly. Stories are told of the desert fathers and mothers beginning their day by collecting stones, counting them out in sevens, and filling their pockets with them. Then, as the day unfolded and they went about their duties they would finger a stone, pray, and then drop the stone as they walked to their next task; when all the stones were gone, they would stop and once again collect more. These prayers weren’t meant to be finished, but were never-ending, a way of praying that was a way of life, drawing the observers daily into a deeper consciousness of being “followers of the way” (the first name for those who followed Jesus Christ).