The running plan is achievable and enjoyable, the app keeps a log of your runs & achievements and awards you with badges, and you can also share your progress with your friends on Facebook, Twitter, or by mail.
Motivation is the key factor in long distance running, and 21K Runner keeps you motivated - it's the true magic of this app, and it's built into every screen.
The Ultimate 1/2 Marathon training app: 21K Runner is the easiest and most successful program for training for your first 21K.
21K Runner improves your fitness with an awesome training program.
Built by pros and with proven success, this is the ULTIMATE half marathon training app.