Recently I linked to this post and enjoyed it The Grandmaster in the Corner Office:, it looks at the best Chess players and how they reach the pinnacle
"Similar findings have been replicated in a variety of fields. To become exceptional you have to put in a lot of hours, but of equal importance, these hours have to be dedicated to the right type of work. A decade of serious chess playing will earn you an intermediate tournament ranking. But a decade of serious study of chess games can make you a grandmaster."
This is similar to some of Malcom Gladwell's work and National Coach Dan Proulx has alerted me in the past to the concept and studies of 'Deliberate Practice' (which is referenced in the article). Basically the best results are thought to come from practice that is repeated frequently, has feedback, is goal driven and that is not inherently enjoyable.
Definitely inspiring as things get back into the nitty gritty of training/pushing boundaries and decisions are made on where to invest time.