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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 up to 12, you should consider a treadmill with an maximum of 12 degrees. This is a strenuous exercise that makes you feel more like climbing hills than walking in a straight line. It is recommended to work up to this by gradually increasing your slope over time, advises Burgau. Begin by walking at a slow angle for a short time then