Compare a second grader's coordination with a third grader's.
Second graders are working on hand-eye coordination with one hand, while third graders have hand-eye coordination with both hands.
Second graders' fine motor skills often lag behind their gross motor skills, while third graders' fine motor skills are catching up.
Second graders have trouble coordinating physical and cognitive processes, while third graders have mastered the skill.
Second graders are still developing dexterity while third graders are ready to learn rhythmic motion.