Watering plants

Photo: Thinkstock

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Think "half-time" (30 minutes). Arrange a carpool for your child's ballet class or soccer practice, Stack suggests (that way, you'll cut driving time by at least half). Wear a wireless headset so you can water plants or pick up toys as you talk on the phone. And, whether you're cooking chili or baking cookies, make a double batch, freezing what you don't use.