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Take Your Treadmill to the Next Level With a Treadmill With an Incline of 12 If you're ready for taking your treadmill exercises to the next level, consider a machine with a maximum incline of 12. This is a strenuous exercise that makes you feel more like climbing hills than walking in a straight line. Burgau advises to gradually increase the slope. Begin by walking at a slow angle for a short time, and then gradually increase the incline. What is an Incline Treadmill? You can raise the flo