Platform: iOS, Android; Free

RunKeeper is considered one of the best fitness apps on the market. Use the app to keep track of your running, walking, cycling, hiking, and biking on a detailed map; with info about your pace, distance, calories burned and time displayed on screen during your workout. RunKeeper will keep track of your personal records, so you always know your fastest mile. The app will also send you emails remind you to lace up those shoes.