Do I Get As Good of a Workout Outside as I do on a Treadmill?

Treadmills tend to overestimate speed and distance, so your outdoor runs may be slower. To make sure you're prepared for the road, add a one-to-two-percent incline to the treadmill or increase your mileage by about 10 percent. If you've never run on an incline, be sure to ease into it, with 20-to-60-second segments.