Half Marathon Trainer 13.1 21K

Half Marathon Trainer 13.1 21K is a health & fitness app by Zen Labs Fitness with 50,000+ downloads (about 59K estimated). +64 installs in the last 7 days. Rated 4.6 from 905 ratings. Released Mar 24, 2012. Install growth, rank history, SDKs and ad networks.

From the store listing: “■ The Official Half-Marathon Trainer App ■ Official partners and the ONLY C25K (Couch to 5K) app featured on FITBIT and SAMSUNG smart watches! ■ Featured on The New York Times, Los Angeles Times, The Washington Post, The Guardian, The Huffington Post, Men's Fitness, Forbes, Mashable, Glamour Magazine, Popsugar…”