Deep breathing works better when it's done slowly. Slow your breaths down by counting slowly to four as you inhale and again as you exhale. To slow your breaths even more, hold for an additional count of four between in and out breaths.
Psychology Tip of the Day: Teach Deep Breathing to Your Children
Children can benefit from deep breathing, too. Teach your child how to breathe deeply by having him lie on his back with a toy on his stomach and practice making the toy rise with each deep breath.