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Take Your Treadmill to the Next Level With a Treadmill With an Incline of 12 If you want to take your treadmill workout to the next level and increase the incline to 12, consider a machine that has the maximum of 12 degrees. This is a more difficult exercise that feels similar to walking up hills. It's best to build up to this by gradually increasing your slope over time, advises Burgau. Start by walking at a low angle for a short time then gradually increase the slope. What is an I