Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to track running distance [title] Download a fitness tracker app. [step] There are many different apps on the market for smartphone users to choose from. Some of the most popular include runkeeper, mapmyrun, and nike + running.

Ending1: [substeps] The app may also allow you to watch running distances in pictures. Use an app like this, to help conserve the battery of your smartphone. Ending2: These apps typically come equipped with features like a stopwatch, step counter, and tools for averaging speed and pace. [substeps] The majority of these apps are free for download. Ending3: While virtual matches are not very available, running the app changes the equation by 25%, meaning that you won't even see a track on the screen if you're even running, so be careful. [substeps] A tracking app will make the data stream feed up faster, decreasing your pace and increasing your distance. Ending4: If you are not already signed in with your device, you will be asked to sign in with your personal account for this service. [substeps] Tap " track distance " and sign in with your account details, then tap " miles " and your app will install, or use the app's time and area tools to look for a specific distance to track.

Answer format: ending1/ending2/ending3/ending4