Anders Ericsson studied musicians, finding most of the best had spent 10 years and at least 10,000 hours of dedicated practice to reach their peak.
Subsequently, authors found support for this theory by collecting data about highly professional mathematicians and from chess and tennis.
The rule was eventually debunked.
If I had practiced basketball for 10,000 hours, for example, I wouldn’t have made the NBA. 😀
Correlation is not causation.
Vladimir B. Issurin in 2017 published a summary finding that athletes from endurance, power, and combat sports attained world-class status following 4–7 years of specialized preparation with 3000–7000 cumulative hours of purposeful training.
Those athletes had genetic potential, of course.
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