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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 a maximum incline of 12. This is a more difficult exercise that feels similar to walking up hills. Burgau says it's best to gradually increase the incline. Start with a low incline and take shorter walks, then build up to longer walks. What is an Incline Treadmill? You can raise the flooring of a treadmill equipped with an inclin