Application allows to assemble play list including podcasts, music from your iTunes library. Text-to-speech feature reads you back your favorite news article while you work out. Announcements during workout will keep you informed of your progress while controlling the playing media. Apple Watch and other smart watch companion apps also available for install from the respective app stores.
App provides dozens of workout metrics, including weather info. Graphics and detailed historical workout breakdown available across all registered devices (iCloud).
Integrates with FITBIT® via web to get your metrics.

Disclaimer: Continued use of GPS running in the background can dramatically decrease battery life.