Instrinsic motivation, the motivation you feel when you do what you find interesting, and deliberate practice, the goal focused way of practicing in which you, through feedback, make progress by eliminating, step by step, mistakes in your performance, turn out to strengthen each other. Researchers from Estonia, Vink et al. (2014), did a longitudinal study over a period of 12 months in which 163 athletes participated. They found that a higher initial intrinsic motivation predicted more deliberate practice and that higher initial deliberate practice predicted more intrinsic motivation. Over the 12 month period intrinsic motivation and individual deliberate practice were reciprocally related, in other words there was an upward spiral of intrinsic motivation and deliberate practice.