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Take Your Treadmill to the Next Level With a Treadmill With an Incline of 12 If you're ready to take your treadmill workouts to the next level, consider a machine with the highest incline of 12. This is a more challenging exercise that feels similar to walking up hills. It's best to get used to this by gradually increasing your slope over time, advises Burgau. Start by walking at a lower angle for a short period of time, and then gradually increase the slope. What is an Incline Tread