Due to a lack of wind resistance while running on a treadmill, the effort of running on a treadmill at 0% incline is less than that of running on a level road at the same pace. Our Tristar chart can help you get an approximate equivalent effort for zones between running on a treadmill at different paces and inclines and running outdoors on a level surface. Learn how you can use the normalized graded pace incline chart to target different pace zones with slower uphill running efforts.