To keep gross motor skills in optimal condition, it’s important to ensure that children under two years of age get to move throughout the day—preferably a total of four hours or more of active movement. Give them regular opportunities to crawl, climb, jump, roll, walk, and run. Older children should ideally be exposed to three hours a day or more of the aforementioned plus squatting, hanging, carrying heavy objects, jumping off of things, tumbling, and other rigorous activities.