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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, you should consider a treadmill that can be adjusted to a maximum of 12 degrees. This offers a challenging exercise that is more like climbing hills than just walking flat. Burgau advises to gradually increase your incline. Start by walking at a slow angle for a short time, and then gradually increase the angle. What is an Incline Tr