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Take Your Treadmill to the Next Level With a Treadmill With an Incline of 12 If you're looking to take your treadmill workout to the next level and increase the incline to 12, think about a machine that can be adjusted to the maximum of 12 degrees. This offers a challenging exercise that makes you feel more like climbing hills than just walking in a straight line. advises to gradually increase the incline. Start with a low incline and then walk for shorter durations and then gradually increase to lon