<iframe width="580" height="385" src="https://www.youtube.com/embed/47j9QpS9w6M" frameborder="0" allowfullscreen></iframe> <br>Fun 4-hour endurance training ride. Half riding with a small group, half solo ride (no video when solo mostly). Gopro battery die ... <br><a href="https://www.youtube.com/watch?v=47j9QpS9w6M">source</a>