Perk up your energy today with good old-fashioned physical exercise! And before you start worrying about how to fit in a marathon before lunch, relax. Your feats don't have to be huge ones. Just take a walk someplace you ordinarily would have driven to. Take the stairs instead of the elevator. Do some sit ups while you're watching television. The idea is to get your body moving and your blood pumping, not to push yourself to your very limits. Start small and see how you like it.