I know that in the field of running, Nike Run Club, Strava, Runkeeper, MapMyRun and Runtastic are all very popular running apps. They have their own unique functions and advantages, which can meet the different needs of runners. Nike Run Club provides a wealth of running courses and social interaction functions, Strava focuses on sports tracking and competition challenges, Runtastic provides personalized training plans and voice coaching functions, and MapMyRun provides detailed maps and route planning functions. Whether you are a novice or an experienced runner, these applications can provide you with valuable help and support.