Try this simple relaxation exercise/guided visualization. Have your kids sit quietly and comfortably in their chairs. Tell them to close their eyes and listen to the rhythm of their breathing as they follow your directions, which will focus their attention on noticing and relaxing one part of their body at a time. Afterward, encourage them to remember what this relaxed state feels like whenever they feel tension or worry, like before a big test or when they have to visit a family member in the hospital.