Gym membership get too expensive? Running not an option? Here are are a few ways you can take that daily walking workout to the next level. Time to get moving! 1. Add intervals Walking faster isn’t the only way to burn more calories. Researchers from Ohio State University found that changing pace can increase metabolic heart rate by nearly 20 percent over those who maintain a fixed pace while they walk. The study also found that we tend to walk faster when we have longer distances to cover. So set a goal for at least one long distance walk per week, and practice picking up the pace every five minutes or so. 2. Head uphill While it’s great to walk a track, or circle your office building when the weather gets cold, consider adding some gradient to your walk. It’s a no-brainer than you’ll expend more energy and burn more calories than…