"A motor skill is an action that involves the movement of muscles in your body. Gross motor skills are larger movements involving the arm, leg, or feet muscles or the entire body — things like crawling, running, and jumping are gross motor skills. Fine motor skills are those smaller actions like picking things up between the thumb and finger or using the toes to wriggle into sand or the lips and tongue to taste and feel objects.

Gross motor and fine motor skills develop in tandem because many activities depend on the co-ordination of both sorts of skills."