Regardless of whether you are at a national park, beach, or your own backyard, spending time outdoors can lower blood pressure, improve your mood, reduce stress, and slow your heart rate. All of this and other aspects of being in nature also contribute to a stronger immune system. When children in particular get up and away from computer screens they experience less stress, use their imagination more, get moving, experience reduced stress and fatigue, and are able to focus their attention better.