To maximize your workout, learn the different functions of the home motorized treadmill you're using. If you are using a treadmill at the gym, ask a trainer to walk you through its functions before you hop on, since it's not always obvious at first glance. Many treadmills have:

A heart-rate monitor to help you gauge the intensity of your workout (although a wearable monitor will be more accurate, and won't require you to hold the handrails).

A calorie burn calculator that shows you what you're getting from your run—but remember, these readouts aren't very accurate, since they don't factor in your age, weight, sex, and so on. Still, if you do the same workout regularly and the "calories burned" number goes up, that means you're getting more fit.
Pre-set workouts or intervals to help you vary your run. These can be handy because they allow you to just set and forget (no making adjustments and pressing buttons while you're moving).

Speed display showing how fast you're going. This is usually in miles per hour. If you prefer a minutes-per-mile measurement, check this chart.

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