It may seem counter-intuitive—after all, working out can drain your energy quite a bit—but regular exercise can actually make you feel more energized throughout the day. In fact, one study found that exercising in the middle of the day can leave you feeling more energetic and productive for the rest of the afternoon. You should still try to get in some walking throughout the day, but a midday workout could be a great pick-me-up. Photo by nasrul (Shutterstock).