Working out or going to the gym every day before work can be a big challenge, but it will help you stay more consistently energized during the workday. If you typically get groggy in the afternoon, try this five-day experiment. Schedule a 20-minute brisk walk during your lunch hour or early afternoon. This routine will cause you to feel more awake, less sluggish, and less likely to doze off in the afternoon, thereby raising your productivity.