If You’re Busy, You’re Doing Something Wrong: The Surprisingly Relaxed Lives of Elite Achievers: https://www.calnewport.com/blog/2011/11/11/if-youre-busy-youre-doing-something-wrong-the-surprisingly-relaxed-lives-of-elite-achievers/
To summarize these results:
What the Study of Chess Experts Teaches Us about Building a Remarkable Life: https://www.calnewport.com/blog/2010/01/06/the-grandmaster-in-the-corner-office-what-the-study-of-chess-experts-teaches-us-about-building-a-remarkable-life/
Deliberate Practice: