The Flyathlon represents a synthesis of three of the world's greatest leisure activities; trail running, fly-fishing, and craft beer. run. fish. beer. Our mission at Running Rivers is to facilitate the connection of people with healthy freshwater ecosystems through novel recreational events, educational activities and on-the-ground projects. We have established and operate a diverse suite of events and activities intended to engage people in the outdoors, near rivers, streams, and lakes; educate them about the importance of healthy functioning freshwater ecosystems; and inspire them to invest their time and money towards the improvement of these waters.