Jen knows how to maximize her time on the treadmill. Cranking the incline helps you burn more calories than if you keep the machine set to a zero grade. After a 30-minute workout at a 10-minute-per-mile pace, you'll burn 270 calories with no incline, 363 with a five percent incline, 420 with a 10 percent incline, and 482 with a 15 percent incline (crazy steep, I know). Not only will you burn an extra 100 calories or more, but the steep slope also helps tone your tush, thighs, and calves, problem areas for many women. It'll also build strength and endurance, so when you run outside on flatter surfaces, you'll move faster and with more ease. The next time you're hitting the treadmill, add a little uphill action to your walking or running workout. Not a fan of the gym? Then opt for hills outside or go hiking.