By Real Simple
Updated December 28, 2010
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Credit: Beatriz da Costa

To help you flex your muscles more often, leave a set of dumbbells near your microwave and do curls while heating up dinner. Put a yoga mat next to the bed so you can do downward dogs when you get up or at bedtime. Hang a resistance band on the bathroom doorknob and strength-train while the tub fills up. Or use a stability ball as a desk chair to engage your core when paying bills.