Summarize this article:

Like a basic fitness app, a tracker will tell you your time, distance, and average pace. Unlike an app, however, these devices are also loaded with advanced tools like heart rate monitors and pedometers. As a result, the data they provide tends to be far more reliable.  A good smartwatch will set you back between $50-200, but can be an excellent investment if you run almost every day.  For even more precise readings, go with a fitness tracking system that uses separate shoe pods.  Runners who are serious about analyzing their performance will get more out of a wearable fitness tracker than a basic smartphone app. Put in each piece of information as accurately as possible so that the tracker will be properly calibrated for your body. You should only have to do this once. However, it may be a good idea to update your details periodically as your fitness level or body composition changes.  You may also have to specify the type of activity you’re performing, since fitness trackers are also used by cyclists, swimmers, and other athletes. Some trackers offer a list of health-related goals for users to choose from. When you select 1 or 2 of these goals, the device will program specialized workouts for you to help you achieve them. Pull the elastic band over your wrist and adjust it until it’s comfortable. For devices with watch-style bands, secure the clasps just as you would a normal timepiece. Make sure the tracker fits snug, but not too tight. Glancing at the readout on the tracker will tell you the distance you’ve traveled since the start of your run. Along with your total distance, you’ll see your current time, heart rate, average pace, and elevation. You can pause the device at any time should your run happen to be interrupted.  If becoming a better runner is your goal, it will be important to keep an eye on your average pace. Pace refers to how fast you’re capable of running a certain distance. Most fitness trackers save workout data automatically. If you’re running out of storage space on the device, you also have the option of syncing your archived stats to the cloud.

Summary:
Purchase a wearable fitness tracker. Program the device with your physical data. Strap on the tracker and complete your workout. Review the information collected by the tracker at your leisure.