David and Mikkel talk to one of the USA's greatest ever cyclist's, Christian Vande Velde, about training. He introduces us to the how, what, and why of power data and how a new app changes how we look at our data - The Breakaway App - Christian has helped design it to make it more fun and inclusive while using data from some of the world's best to create comparisons. And we can compare against each other, yet only ten people....