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Treadmill Incline - Adding Variety to Your Workouts You can alter the incline of your treadmill to alter the intensity of your workout. Walking or running on an incline mimics the effect of climbing hills, and it burns more calories than a flat workout. As you increase the incline the heart rate will increase and various muscles are strained. This will help you avoid plateauing in your fitness level. Strengthens the Heart Incorporating incline treadmills into your exercise routine increases the inte