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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, think about a machine with the highest incline of 12. This will give you a challenging workout that feels more like climbing hills than walking in a straight line. It is recommended to work up to this by gradually increasing the slope over time, advises Burgau. Begin with a lower incline and then walk for shorter durations before moving to long